Supporting accounts would need support in the QML appstore client, and then in libpebble to remember the account id and make it available to apps. Both of those should probably be done in collaboration with RockWork - I don't want to keep fairly in line with that so we can both benefit from bug fixes on either side.

From a libpebble standpoint the code would probably be identical in RockWork and RockPool, but what about the appstore client?

I think some people believe that there's not much of Pebbled left in RockWork. A lot has been replaced and refactored, but it's important to appreciate that is it really still a fork, and those guys deserve contribution credit.