Well, you have a ton of pretty non-specific/involved questions, so I'm not totally surprised there's no answers yet. I guess I'll try and answer what I can.
ISBoxer is as easy or complicated as you make it. You should be pretty much good to go just running the Wizard. Once you have the hang of things, you can look at some of the more advanced features, but the wizard is fine for most newb usage.
I can't speak from experience on PVP since I'm strickly PvE, but you can still multibox BGs and I believe arena using the multi-person mounts. I'm not sure on the Soul Trader or other interactive pets.I'm mainly interested in PvP. I haven't been very active during MoP but I've done some research and /follow was removed in battlegrounds in 5.2. Since multiboxing relies on follow, is it still possible to PvP? I know some people use Ethereal Soul-Trader and/or multiseat mounts but how viable are these? Can you still multibox in battlegrounds and arena 'properly'? I'm not interested in multiboxing PvE and world PvP is lame.
"Good" is a subjective term. Some people love melee, some love ranged. Some people love to use both. No one is going to be able to tell you what you will do well with. Especially since you only have limited experience with the latest expansion and no experience with multiboxing. Review the threads in the PvP forum and the Group Composition forum. Decide what sounds fun to you and give it a try, you can always make changes later once you have a feel for what you do and do not personally enjoy.Also, which classes are good for PvP from multiboxing point of view? Some people here say that only melee classes are viable now. Why is that? Ranged classes seem much easier to multibox in PvP to me. But then again, I don't have any experience.
Why wouldn't you be able to do instances with 5? I do it all the time, as do many other multiboxers. I'd think you'd have more of a hassle with 5 in PvP as you are far more noticeable and, especially as a newbie, detrimental in small-scale BGs. Plus with no /follow, it means more toons to watch to make sure they aren't trapped or otherwise useless to the team.I'd also love to get some advice on team size. Currently I'm thinking of going either 3- or 5-man. 3-man would be good for instances, I could fill all the DPS slots myself but my 'firepower' would suffer a bit(compared to a team of five). 5-man sounds awesome in battlegrounds but I wouldn't be able to do instances. I plan on leveling in battlegrounds mostly if it's possible. Currently I'm leaning towards 5-character team but if multiboxing battlegrounds is difficult/impossible, it'd be a waste of money.
My personal opinion, given you haven't played this expansion or done any multiboxing, is start with 3. You can PuG extras for dungeons if you need to, you can do scenarios in MoP and it's less to worry about as you're learning. You can add more later if you want to.
Last I checked, Enhancement Shamans, Ret Pallies and DKs were all more popular in PvP than Warriors for multiboxing. Pallies and Shamans also give you the ability to change specs for healing/tanking {pallies} and healing/ranged {shaman} so you can mix up the team composition depending on what you want to do at any given time while still being a single-class team. Ditto with druids.Since I'm a beginner, I'll probably make a team with only one class/spec. For melee class I'd probably go warriors. I bet their movement would be very handy and I love the class. My main is a rogue but multiboxing rogues sounds really difficult. For ranged(DPS or healer) priest or elemental shaman. What do you think about my choices, what would you recommend?
Rogues can be done, there's been a few people who managed rogues {and feral druids} despite the combo point management by mapping out a standard rotation to use. I really can't speak to their effectiveness in any way, though. I haven't touched a rogue since BC and the only reason I had one was for opening boxes.
For the ranged, I don't really know about multiple priests. I know they are popular in PvE, but I think people tend to prefer Hunters, Warlocks or Mages in multiples for PvP.
But like I said, read the forums, play what you like then come back with more specific questions once you get a feel for it. You may find a lot of things would be useful that you haven't considered like rezzing {in and out of combat}, unmounted movement, CC, anti-cc, mitigation, etc.
http://www.dual-boxing.com/threads/4...ling-RAF-SetupHow would you recommend me to RAF my other accounts? Should I refer them all on my main account or should I 'chain refer'?. Also, do I get a month of gametime on my main account when I upgrade my other accounts(since upgrading also gives you one month of gametime)? Should I have all my multiboxing accounts on the same battle-net? Or rather, is there ANY benefit on having them on separate battle-net accounts?
https://us.battle.net/support/en/art...ruiter-rewards
http://www.dual-boxing.com/threads/4...ounts-Worth-It
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