I've made the same suggestion as NHawk regarding special purpose fleets.  I would like to see two different kinds of fleets.  One would be a strike fleet (CVBG), consisting of two CVs, a cruiser, and escorting DEs.  Then you'ld have the amphibias assault fleet (AABG), consisting of two to three cruisers and escorting DEs.  The CVBG would not have LVT's or PTs enabled; the AABG would.  Eventually, I'd like to see an amphibias assault ship added that would serve as the VH for the AABG.  I'd also like to eventually see a CVE added to the AABG, but with the max speed for the AABG appropriately (and historically) restricted to around 18 to 20 knots.  Only a very limited planeset would be available on the CVE, and the slower fleet speeds would prevent heavy fighters and large bomb loads.