Wow...not the response I expected.

Space is vast, and the majority of all scenarios take place in open space.
Matter of fact (the fact being SFB references) the idea whole idea is to engage the enemy AWAY from valuable points, like bases and planets, whether it be to close with for decisive combat, or to pin enemy forces and prevent them advancing towards specific objectives.
Obviously, Bases (to destroy) and planets (to capture) are the ultimate goals, but most battles take place outside of these as each side tries to gain an advantage over the other.
Small is too small - teams should have the option to maneuver, room to get some distance and fight at range if they like. They shouldn't be forced to knife fight (which some races are not equipped for) or disengage.
Continuing with Medium as the standard should work - it's worked so far. Perhaps when the scenarios are played out and the different victory conditions are factored in, it will suggest whether a change from status quo in required - in either direction
What about the the disengagement time limits?