However, I wonder how it would work with skewed team games..? *I know those are highly uncommon but...*

To quote myself from the UV suggestion:

I'm not sure how to deal with games having unbalanced team sizes... the easy way out would be to only display the per-player number.

Like you said, seeing how uncommon they are (and since they have to be practice, they cannot be ranked, if memory serves), I think taking the easy way out would be acceptable.

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By the way, in an overview which also lists "Diplomacy: In 7 pieces to last for 2 turns", which of the following three phrases is best:

• Diplomacy: 2.25 pieces per turn
  
• Diplomacy: 0.32 cards per turn
  
• Diplomacy: 3.11 turns per card
  

All three are equivalent in meaning, but I wonder which is the "most readable" / "most understandable" in terms of deciding whether the number of cards is reasonable?