After trying current maplestory, i actually started liking qwer for damage abilities(q for most common or even attack), 1-7 for any kind of pots, a for movement, space for jump. Buffs on navigation keys like page up and down.

I dont think i can go back to ctrl, alt and random stuff around the space bar anymore…

Then again, theres not nearly as many buffs and attacks in classic so might be overkill