Well, you could easily restrict yourself by not equiping a weapon, not casting while shifted and not using the paws more than you're allowed. But really, sleeping more just to play by the rules? As long as you don't overuse them in no-sleeping areas, it should be fine, no?
And yes, without the fix you will suck. You can read everything
here
fixed resistances instead of improved resistances
1d6 instead of 1d12 damage
no immunity to non-magical weapons
Even worse is the greater werewolf
no improved thac0 & saves
claws are 1d6+2 instead of 2d8+3
no regeneration!
In other words, it sucks.