you can put lockers and limited slips in the front ends. I have done it, your turning radius in 4wd is very limited and people either go with a selectable locker or they make a manual CAD with a bicycle brake cable or go cart throttle cable so they can negotiate turns in 4wd. this allows the driver to have 3 wheel drive and the two front wheels arent working against each other.
I have seen people running spools up front as well.

 

swap your long side 2 piece axle for a solid 1 piece axle from EMS offroad and your problem with the CAD is no longer a problem.....