As far as game balance goes, the easiest thing HTC could do is add the variant og the LVT with the M3 Stuart turret on top. Being able to have some type fast firing of AP ability vs the sand castle makers on the beaches (parked enemy tanks picking off LVT's). The 37mm could fend off M8's, M18', and if close enough Shermans and Panzer IV's.
I supposed adding in the Higgins boats would be kinda neat. Getting the troops to shore faster would be nice, but the troops would have to run from the beach. If HTC would consider doubling the distance in which the troops could be let loose from the map room this may be a completely new aspect in HTC (running troops would be more prevalent more often, at least for coastal bases).
I agree though, that the shore landing part of the game could use a shot in the arm.