Just saw this picture in Indonesia ToS Group, i hope IMC will update this for iCBT soon.
https://scontent-hkg3-1.xx.fbcdn.net/hphotos-xta1/t31.0-8/12194603_10205533367004098_3725414352434009618_o.jpg
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this feature is great 
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Finally! Really good news. 
Edit: To expand tis reply (much later), its seems the TOS Team was already working on a keybind config feature for some time (the article is almost a month old, link below):
Q) Did you include the key customization feature?
A) The development is already completed, some testing is in progress.
Also in the same article, twas asked about when a new Class (Cannoneer, I believe) is going to be introduced, and the answer was: Soonâ„¢. Its worth to mention the news of the upcoming class was already posted here, along with the Kabbalist (credits: @nekomiko)
Source article (in Korean): http://tos.nexon.com/news/gmnews/view.aspx?n4ArticleSN=33
I hope it will support binding mouse3, mouse4, mouse5 and so on.
OMFG!!! My left handed self will be most appreciate this!! 