Panzerbush
Those of us who have been around for a while will recognize the term. Naval combat is much, much more flexible, as is high-movement land combat, but suffers from "panzerbush" (hopping from cover-to-cover in full sight of the enemy, or attacking and running away to a hidden location) is an issue. The solution, from Panzer Leader, is to allow opportunity fire if a unit expends at least 1/4 of it's action points within range of a unit that a) can hit it and b) is set to do so (e.g., to do interdiction fire, either artillery or aircraft).
I think this would materially improve the mechanics and make aircraft - and artillery - all the more useful to spot and hinder, say, an amphibious invasion, or a bunch of battleships doing a drive-by shooting of a land unit, all the while a bomber just sits there and watches as the battleships disappear into the distance.
Stacking, aka "the malta problem"
Malta is the key to the Med, and it should be difficult to take. As-is, because we can't stack, it is easy to take with a few ground-attack bombers and some fighters to spot and soak-up the air defences. Nuke the AD unit, drop a paratrooper in, and bingo, Malta has fallen.
Same thing applies to Gibralter.
I have the sense that this may be beating a dead horse - if so, it needs a few more hits
