We have gone over the slots many times

For various reasons, more slots in bags is a horrendously difficult, and actually dangerous code change. It can firmly be blamed on the original coders of EQ.
(this is in no way a promise) We are much more likely to get more bank slots again, or maybe a special "filtered" bank tab, or even "guildbank" like interface for your bank.
BUT I am not likely to be able to get a "just for tradeskillers" extra bank space through either realistically. (just code wise this is easier than making bags larger)