I found Rapid Fire the worst set of rules ever written, alongside Panzermarsch (sic). FoW whilst a good game is not a wargame, but it's still better than RF. The very old Tank Battles in Miniature are much better, although that's a relative term.
I've been using my rules for 20+ years now, a combined WW2/modern set that can do a regiment game in 4 hours at a push, at 1:1. A rough draft and all the data files are free online. Mainly because I don't have time to do all the necessary "if-then-else" clauses that most published rules seem to require.
Feel free to email me for a set. Oh btw, a variant for SCW will be on test at the birthday bash
sultanbev at googlemail dot com