I've heard of people doing this.
I got a used slash and the suspension was not moving freely. I have a 1/8" reamer I use on other cars but the reamer didn't do anything. It turned out the hinge pins were bent. Not much, but enough to bind the suspension. Replacing with new hinge pins freed up everything. I've run Traxxas trucks for years and never had suspension binding that couldn't be traced directly to a bent hinge pin.
If the pin is bent, you would have to drill out an excessive amount to make the suspension free. Try new hinge pins first and see if that makes a difference. They don't have to be bent much to bind the suspension since the use of screw pins means the pin can only pivot in the bulkhead or axle carrier, not the A-arm as in cars that use straight, plain hinge pins.