I have read a few good ideas here, I would like to add some more and expand on some previously listed
1. For bases.
a. A large field, I think large fields need to have larger towns if not small cities close to the field itself. This would make the base itself more difficult to take and promote urban combat to some degree.
b. Medium field, A smaller town a bit further away from the field
c. Small field, I'm sure you have figured out the pattern
d. Ports, IMHO I think there ought to be se sort of seaplane option.
e. VBase, IMHO I think there ought to be a small dirt strip capable of launching a few select ordless light fighters.
2. The idea of having multiple types of naval task groups I strongly agree with.
a. A Japanese task group with that's countries respective ships.
b. A British task group
c. A German task group. I may be getting a little dreamy here and I know it wasn't constructed, but a Graff Zepplin class C.V with a Bismark Class BB would be a sight to behold.
3. I agree with the idea that downed pilots ought to be able to take a map-room. I even agree with the 4 20mm A-20 as long as F3 mode is completely eliminated for all bombers that can take off with out bombs.
4. Seasons, I think it would be interesting to fly around with the color changing on the leaves of the trees
5. Weather. I may be getting overboard here, but I think randomly changing local weather events would make play a bit more interesting
a. Ground fog, make bombing gv's more difficult
b. 15k overcast stratus layer.
c. Thunderheads
d. Different types of regional maps. I.E desert, snow, steppe, ect.
6. A system of being able to use indirect fire methods for G.V's and artillery if its ever added.
7. I don't enter manned guns often, but when I do it would be nice if it were auto trained on the nearest con.
8. C.V puffy ack. C.V puffy ack ought to for no reason what ever be-able to reach land. The most annoying thing in AH is flying 10k over town to and one ping oiled by ack. Also puffy ack needs to be a function available 5inch guns for a task group. Lets say for arguments sake that a task group has a total of 20 5inch guns, if no guns are destroyed or manned then puffy ack ought to be full force. Now, if 10 of those guns are manned or destroyed, then the affect of puffy needs to be cut in half. I find it interesting that you have a task group that is down to one destroyer in which all guns are manned, and puffy ack is at all forces.
9. A limited FTP plane set for the MA, (LA5, 109F, Spit5 p39, ki61) ord disabled.
10. Sheep