I think it would be great if we could check how much time you need to wait until you can rest without actually starting to rest.
For certain classes, i.e., druids and rangers and those with EFUSS points in wilderness survival who do not need a campfire and/or food to rest, this would allow you to check if you can rest without you accidentally unbuffing yourself in less than safe places.
You can just hit R anywhere and if you aren't in combat it will tell you how long, even if you can't rest there.
It would be great, yes.
Adding a simple 'dialogue' option for resting could help alleviate some other problems with accidental hitting of "R" in the wilderness as one of those classes who don't need a campfire to rest.
Really REALLY low on the lis of priorities, to be honest. We've done without for years and years. Will probably be fine.