yeah it needs a restriction on short rests because if there isn't one, some classes get OP. In pnp the GM determines the number, in the game you could argue that Larian are the GM, determining the number they'l let you get away with, but the general guideline is 2. So IMO the game should allow 2 short rests per long rest. For long rests, if you want to have two close together, it could do a think of basically forcing a timeskip to make it so you still only had one per 24hours. Again though, that stuff is partly linked to actually having time play a part in the game i.e. timed quests being the major one. but obviously certain spell durations is another thing