I have to agree with MarkAT & maniac.
Make field capture possible, but make it TOUGH! Make teamwork a prerequisite to a successful capture.
Maybe the only thing enabled to carry troops should be the LVT2?
For one that brings the CV's & shore battery's into play. Giveing us more strat, and more legitimate targets for the bombers. The LVT is SLOW, relitively easy to kill.
For another players would be able to see when there is the threat of a capture. NO CV near = no capture likely possible.
Last, as fields got farther away from the channel & the CV capture would get much more difficult, timeing would be much tougher. Adding a balanceing feature & preventing someone from overrunning a country.
Just a thought