Blueholme & the original Holmes rules state that all damage is 1D6 (or in some cases half a D6). I believe this is all based on role playing so the PC's and monster are all very similar and rather than min/maxing you can decide that your PC will only use a sling or some weapon that normally would only do little damage.
So, what's the thoughts on this? Do you like it? Obviously there was a reason for the change when B/X came out.
Have you played this way?
Personally I didn't realize until after playing one game of Blueholme that I was supposed to only being using D6's for damage. The next time we played I switched it, and quite enjoyed it. I suppose the only issue is that you really don't need to buy a polyhedral set, all you need is a d20 & a d6 to play (and DM you need some percentile dice for treasure etc).