I think the territory income bonus could easily support HRs for submarines. I have always found subs to be rather complicated and somewhat underpowered in A&A. On the old boards my HR for subs doing economic damage was pretty simple. Any submarine may elect to do economic damage on factories in range of a sea zone (2 spaces), but most forego movement to run the attack. The defending factory hits at a 1, to destroy the submarine immediately, same as sbr. Otherwise the sub does a run on the Nations shipping at a cost of 1d6 at the factory being attacked.
Subs are cheaper now than before, so it might make sense if the factory hit on a 2 instead of a 1. But I like doing it that way for ease of use. Basically having them work like bombers do. SBR in this case can stand for Submarine Battle Run, or “Submarine Blockade & Raid”, or something like that :)
In the old games income was removed directly, but in the newer games I would just keep it the same as sbr mechanics for simplicity. Or you could try other ways to implement them, but I don’t see any reason why it wouldn’t work with the T.I. Bonus. I’m not sure if the OOB game in 1942.2 would support subs doing economic damage without some kind of boost to overall income. I can imagine UK getting strangled early, or Germany getting strangled late:) But with the bonus at least you’d have more money to buy both subs and destroyers (to kill enemy subs before their economic damage got too insane). It would be an incentive for the purchase of ships, especially destroyers to counter.
The 1942.2 setting is I think the optimal one for the income bonus.
I like it with the option +1 ipcs for each Victory City controlled at the start of the turn.
In case anyone is curious with the VC rule added the numbers look roughly like this in 42.2 for the opening round
Russia +2
G+4
UK+2
J+3
USA+3
It is also possible to give the VC bonus separately, instead of the T.I. bonus, in which case I like it at +2 ipcs (or you could do 2 ipcs with the T.I. Bonus as well, making the territory worth a total of 3 ipcs if you include the normal T.I. bonus, 1 for the territory 2 for the city.) I see lots of different ways such rules can be used
