Without a day/night cycle system, I think the best way to handle it would be to give the player a total of 2 short rests per long rest. It wouldn't make sense to have more, in my opinion, because you'd still be traveling, fighting, meeting NPCs, etc. which would also take time out of your day. They probably left it at 1 short rest to force players to return to camp for the extra story progression. But allowing 2 short rests would still force players to return to camp and would also give Warlocks and other classes a bit more of an edge.
EDIT: I also think that short rests shouldn't automatically heal you without repercussion. In 5E you use hit dies to recuperate health points. This should be added into the game because this would also give players reason to long rest.
Could they simulate the renewing powers by giving classes with renewable resources a power gathering daily on top of the one the whole party gets?
