Yes. I do it when I need more contrast. For T-max 100, I go 8 minutes in Kodak Rapid Selenium Toner 1:3 for a one stop expansion. Be sure to use a non-hardening fixer originally or to re-fix in plain hypo before toning.

I always do it with negatives that have been dried after I've printed the negative straight and decided that it's what I need to get a better print. Very handy for printing on Azo, which only comes in grades 2 and 3.