The thing about bump steer in an M chassis is that since it's there, you may as well make it work for you. I tend to run my car VERY low so it's not as much of an issue, but I do try to make it advantageous.

EG: I set my toe to be almost completely neutral at ride height. So, if the car is rolling along a straight, the wheels are dead ahead and providing minimum resistance. When I come off the throttle to enter a corner, the wheels toe in a little (which in theory is a bad thing) and this sets up the outside wheel for a little more of an aggressive posture and maybe a little extra bite. Exiting a corner under full throttle, the wheels will return to neutral or toe out a little. I find this helps snap the car into the proper line for exit.

I suppose toe in at the entrance to a corner could be a bad thing if you're dealing with a traction roll problem, but if you remember the cardinal rule of minis "Slide the front, stick the rear" it shouldn't be an issue.

Of course, all of my tuning is based on running on an ultra smooth, carpeted track, so it may not apply to all situations. I suppose the other factor that may make all of my advice moot is that there is so much slop in the steering anyway that toe is the least of my worries.

Jim