if you have more than 4 accts farming ... spam on your bank toon.
make that bank toon 2x profession somethings
do your professions while doing that ... I did smelting (mining)/ DE (enchant) on my bank toon ... and then ink / alch on another bank toon
There's a lot of stuff you can do on a bank toon ... as far as botting in a major city ... other than dailies? not much... you can fish up to max, or almost max in dalaran from lvl 1 in the fountain (it's in professionbuddy ... it will even train for u - maybe it's in AA2 as well?)
You can also be a cook ... make stuff for ur raiding toons / raid?
There's a lot you can do.
My alch / ink did a ton of stuff when I raided... I was banker and had tons of glyphs, tons of flasks, pots, elixirs, etc
I had all of the mastery's between my toons on that realm ... and multiple other alch guys across all of my accts - just to help my guild out ... nothing to do with a 90 after it hits 90 for ole' kicky... at the end of cata I had over 40 transmutes a day between my accts lol