Instead of Multiple attacks, how about using the 4e rule and make it multiple weapon damage (one attack ie 5 times weapon dam + str and other bonus from weapon). If you have 2 weapon fighting from feats, then maybe it 4x weapon with one hand and 1x weapon with the other (at -5), or what ever suits. This would make DR less of an issue though, because the damage you dish out should bypass alot of it.
Calculation of attack will be quicker, no more issues of having to calculate different attack bonus for upto 5 attacks.
Just a thought.
Cheers
SK
