Oh I see now you said nerf bars. Good luck getting drag racers to install nerf bars. Heel guards would be a good addition though that I think most drag racers would be ok with.
Other than that, pegs with grippy spikes like Richie's pegs will also help keep the foot on the peg. I notice a lot of the drag bikes don't even have grip tape. Just a round bar. Fuck that.
Grippy pegs, heel guards and riding boots will greatly increase rider protection.