A Fleet Problem

[5cats]

Here's what bugs me, not a bug but something that could be done better.

Your fleet, say 4 Hvy 3 Lt and 4 Trans gets attacked by a couple of submarines, one of which survives the attack & stays there. On your turn you'd like the Lt Fleets to attack the subs, but NOT the Hvy. There's no way to do this except to move the heavies OUT of that space! I suppose one could move them out, have combat & then 'take back' the move, but cheesh! what a pain. Plus if supplies are tight there might not be enough around to move 4 over, then 3 to fight the sub.
Also, what if you want an air unit to attack the sub? You'd have to move everyone out first!

Any chance this could be fixed? Some ability to select who goes into battle?