Great suggestions!
I do like not having to be married all weekend to the game, so regen time is fine with me… but the 3 min suggestion is cool too.
Like the comet being the middle deploy unit. Drop low one and add a new higher more expensive one.
Since this is an IPH based war… its all about the money. In game money. So have some units that you can buy that are way up in cost. Comparable to buying with gold. Have an option to regen with in game money… not just gold. You still have the gold spenders spending, but you allow the high IPH players to use that IPH to compete with them.