ORIGINAL: irrelevant
Has any consideration been given to limiting somehow the number of AKs that can unload supply over a beach (as for an invasion)? As it is, an infinite number of AKs can all unload simultaneously.
Actually - this seems confused. OVER A BEACH the number SHOULD BE unlimited! It is in a port - at the much more efficient port loading rates - that restrictions are needed - both for number of ships - and also for size of ship. [My first ship - AKA-249 USS Francis Marion - was the last APA the US ever built. She carried 22 landing craft - and could land almost anywhere cargo as large as an M-60 tank - beach or not. So long as "anywhere" means "some suitable site near the objective" and not literally every meter of coast. If you have more ships, you do two things: spread out over more "beach" - wether or not it is actual beach; phase the landing craft: no reason you cannot have wave upon wave of them coming ashore from ships anchored out.]
Now theoretically a beach might be too small to permit an infinite number of ships to land. Normally - you just pick additional beaches. But some places there are no beaches at all - and what there are are very limited. Since we have no way to rate beaches - or even say "no landings here" (the entire west coast of Kerguelin Island - well actually most of the island except in the east - has NO suitable landing points - and we are talking over a thousand square mile island here - a wierd one I happen to know in detail). As a general rule, our hexes are so large there is a landing point. The only reason to limit landings might be for very tiny atols/islets.