I haven't played Solasta, so can you explain what you mean in more detail?
As far as I am aware, short rests are pretty much handled as they are in 5E. You basically could do as many as you like but in order to heal your characters up, you would have to spend the available hit dice. And once spend you don't get those hit dice back until you do a long rest.
That way you have to make a decision whether you want to burn through all you hit dice to heal up big time or hold back on them a little bit so you could squeeze in maybe another short rest along the way before you have to long rest again.
