Remember that you have a latency betwen then two accounts, so you need take the in to account when buttonmashing for targeting to work the way you want.. you get the hang of it pritty fast

for healing you can use some different stuff, i use ISboxer with grid and Clique, works very good, that requires ISboxer tho, cant say any other styles as ive only use this one, i can imagine using F keys with simple /cast [target=name] could work good for 2 chars, as you dont have to use as many keys and its simple

Addons.. nr1 is ofc Jamba, as Buetzel said, godsent, very usefull

hope it helped abitt