I've gone into more detail on this over at Bugman's Brewery:
http://www.bugmansbrewery.com/topic/46969-pick-up-parameters/Essentially, we were trying to develop parameters for "come with a list and play" days, and have found issues with the current (lack of) system.
What we are trying out to add balance to games, but still maintain a certain amount of list-building freedom in accordance with the spirit of the game, is minimum models and maximum wounds.
For a "smaller" game (think 1k or 1250 in 40k), we were thinking of doing a minimum of 30 models and maximum 75 wounds, or 35/70 (essentially requiring an average of 2 to 2.5 wo per model).
Wondering if anyone else was taking this tact, or if anyone had thoughts on this, or suggestions on setting actual values. Obviously this would require some serious testing and scaling, but we thought that might go faster if we could incorporate other's experiences.