Allow for multiple transfers, and switching back and forth from attack, transfer, placement.
These rule changes allow for a game mode that I still play on warfish.
The ability to switch from transfer, attack, and placement make gameplay on your turn flexible. There is a limit to 3 transfers, and just X armies in reserve. A limit on max armies on territories, and max in reserve. No card bonus, and an elimination bonus.
The rest should be doable by bonus map structure (as long as bonuses can overlap on the map).
Very fun mode, just didn't see the ability to play this mode... I would like to port the mode over, but just simply can't without these rules in place.
You can use ctrl+click during the attacks phase to deploy armies.