I think the way to fix this problem is not to let the PCs stack multiple short rests back to back. I used to allow this when my party only included a cleric b/c I didn't really see any reason not to allow it.
No Limit per Day: You can take as many short rests per day as you want.
Using Powers while You Rest: If you use an encounter power (such as a healing power) during a short rest, you need another short rest to renew it so that you can use it again.
Seems they put a lot of effort in to say 'Actually, yes, there is no limitation on short rests, and here's an example of how to use it. Healing powers, it would seem, are not only kosher to use during short rests, but they flat out give them directly as an example, then say you can take another short rest to renew them.
However, my party now includes a bard. the bards "song of rest" is specifically designed to prevent this sort of behavior b/c all PCs add the static bonus to all healing surges spent during that rest... but it also signaled to me that the other leaders were probably intended NOT to be allowed to apply their healing power bonuses during a short rest (otherwise, song of rest is redundant) unless they didn't spend their healing powers during the preceding encounter.
If leaders were not intended to use their powers during a short rest, why is there a feat called
Restful Healing sitting in that same book bards come in that flat out say 'Use your powers during a short rest to gain a bonus?'
It is really hard to claim Rules as Intended, when they give you feat options that only work during stuff you claim is verbotten.
All that said... a short rest is five minutes long. Sometimes there's a sense of urgency and five minutes is all the time you have. It depends on the call of the story. But sitting there and going 'BAH THE RULES DON'T SAY YOU CAN' when they verbatim do... is foolish.
Big deal. People get to use their healing surges more efficiently out of combat than in combat. They get rewarded for taking longer rests. How is this a bad thing, exactly? Last I heard, healing surge efficiency wasn't a breaking point of the game... you still only have the same amount of healing use -in encounters- and if it means they can have more encounters per day, that is a Good Thing(TM) not a Bad Thing(TM).
So now, a "short rest" is that stretch of time between encounters, not something the PCs actually have to do.
And it is about five minutes long.
Duration: A short rest is about 5 minutes long.
It is automatic and includes all of those post encounter activities that are so common: healing, looting, searching for secret doors, etc... and it lasts as long as it needs to... but the PCs don't get to recharge their powers and then have an encounter that doesn't include any challenges.
Provided 'as long as it needs to' is 'about five minutes long.' The book is pretty clear about the duration of a short rest. And clear you can take more than one, or as many as you like in a day. The 'must have an encounter in between' is artificial.
I guess I sort of look at this the same way as the warlock that carries around the bag of mice to curse and kill to trigger pact boons... awfully cheesy.
What breaks if you allow it? IF it is broken, something breaks. What breaks?