DT, Payn, Yodakore and some other folks played a capital-ships only game earlier tonight and it was fun, or at least I had fun. I also played one later with Payn where we let people select whichever race they wanted to and that was good too. We need to get someone to make a mod for this to enforce the rules.
The rules are:
Capital ships only--if it doesn't come out of a capital ship factory you can't build it. (Scuttle your frigate factory at the start of the game.)
No scouts (see above).
No frigates.
No cruisers.
No health or regeneration bays on the planets.
No strikecraft hangers on the planets (turrets are OK).
No Novalith cannons (possibly no level 8 superweapons but it's dumb to build them for Advent or Vasari anyway).
No Returning Armada (phase gates OK).
The problem is that if someone drops from the game the AI takes over and breaks the rules, hence the need for a mod.