I would imagine something like this.
First of all, we need a time mechanic. The game currently has no time mechanic and it feels very static. I think a simple "light filter" that changes the look from Dawn / Day / Dusk / Night. wouldn't be too hard.
With time in the game, yes you could short rest as often as you need and gain hit points by spending hit dice the same as we do in table top. A long rest full heal would require enough in game time to pass before you can long rest again. I haven't really broken down how long in real time that should be but, it should be long enough to make it hard to exploit.
Given the fact that Larian decided to use food as resource for resting leads me to believe that we won't get any day / night cycle, leaving the game static and yet another deviation from traditional Baulders Gate and D&D.
How lame.
