Check out the patch notes for the v20 Lovely Update here: http://maplestory2.nexon.net/en/news/article/55909/lovely-update-v20
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This is from the wiki (http://www.maplestory2guides.com/maplestory-2-controls-info/):
"The arrow keys are used to move around and climb ladders. Other default settings include the following:
talk and use portals: [space]
pick up items (money is picked up automatically): z
change point of view: [
item and skill keys: q w e r a s d f 1 – 8"
No sure of the options for changing controls.