I'd be fairly happy with a BT game that allows you to fight for control over a single planet during the course of a campaign, but you could randomize the starting planet and forces within limits set up beforehand.
A computerized "Succession Wars" equivalent would be another possibility, but that gets a little too abstract, to where the individual 'Mech or even lance of 'Mechs becomes totally irrelevant.
What I'd love to see most would be some kind of hybrid, where as a lower-ranking officer (either within a faction or as a mercenary) you can control a small group of 'Mechs, vehicles, and infantry on a tactical level (like MegaMek), but as you promote to higher ranks, you can ALSO give strategic orders between battles to other units under your jurisdiction (which will fight their own battles in a much more abstracted form), and manage whatever planetary resources are within your personal fief. Eventually, you could control groups on several planets, each strategic turn either participating in one battle on the planet where you're located, or else making a jump to another planet within 1 jump. Ideally, it should have interactions reminiscent of Crusader Kings, where you get involved in politics and family advancement to gain influence and power within a faction, controlling some property directly, and other planets or continents on those planets through vassals.
