Reply to 2 more faders on vci100

I like to control 4 decks at a time in traktor and i believe it would be a lot more convenient to have 4 volume faders on my vci than two. id love an s4 but not really an option financially for me atmat.

anyway I wanna see if you guys had any ideas for this, I have seen 3 done where someone had put one right in the middle of of the two orginal.

I'm new to controller modding so any help is appreciated, thanks