You're using Hotkeynet so everything you asked about is legal and possible. However, it's not advised.

Using wasd for follow will eventually lead to your toons veering off from each other. The smallest difference in the way they're facing will become large very quickly. Just use follow.

Jamba is useful for completing quests at the same time, but if you're looking for a tool to broadcast mouseclicks (for accepting quests) then HKN will work. There should be some sample scripts floating around this forum or the HKN website.

People are multiboxing rogues and apparently having a good time doing it. Shadowstep made it much easier.