Josh Sawyer is answering questions on ArvanEleron's twitch feed:
http://www.twitch.tv/arvaneleron
He gave a nice answer to the "stash" question (i.e. why do you have this stash instead of the traditional limited inventory + encumbrance system). The gist of his answer was that the team did not like the traditional inventory/encumbrance management. In a PnP campaign, managing encumbrance is as simple as notifying the GM that you want to return to town and drop off items X, Y, and Z. It takes about 30 seconds of real-time. In a videogame, you have to actually return to the town and drop of the items one by one. That process is not interesting. So they instead put the stash right in the inventory menu, and there is a toggle so that players who want the fun part of encumbrance management (making decisions about what to bring) can restrict themselves from accessing stashed items except when in town.
I expect this will be unpopular with the grognards (but then, that's why they're called grognards), but I happen to agree with the reasoning and the decision.