Epipalaeolithic sounds like a good idea, especially if you want to start around 50 to 100,000 BC. There's also Chalcolithic, which is the transition from Stone to Bronze (the "Copper Age"), but that's probably getting way too in-depth
I personally favour UK/Commonwealth spellings, because I'm British and because there are far more citizens of the Commonwealth than of the USA!
Cool. Then I'll change Paleolithic for Epipaleolithic/Epipalaeolithic

.
I've started playing the MOD at Epic Gamespeed and I've noticed everything goes very fast. I thought it would useful to add a new Gamespeed which will fit between Marathon and Epic Gamespeed. For example:
Normal Speed has a 100% rate.
Epic Speed has a 150% rate.
Marathon Speed has a 300% rate.
Then, the new Gamespeed would have a 225% rate.
Also, I think it is necessary to removed a couple of techs (one off each new era) to speed up the game experience. I was thinking to remove "
Natural Pigments" and put "
Hunting" instead.
And on Mesolithic era, maybe "
Fibers" is not really necessary. Another alternative would be replacing "
Wood Working" with "
Early Fishing". I think Fishing should not be available so late (fishing boats would still be available later with boating).
Other change I think would fit well with the game, specially in the early start, is setting animals to give
Commerce instead of
Production. So we would gain food and some commerce coins when killing an animal. We all know Grain Gathering and Hunting were the main sustenance for the Stone Age people, and we already get Commerce from Seed Camps. I think it would be fair to get at least 1 commerce coin from animals (maybe 2 from the strongest ones). This would also increase there importance to send hunters outside your borders.
Also I'll take this evening a look at the game code to check if I can disable all the traits until players reach the Neolithic era.