Print a dispatch sheet with info on time left on 100 hour, ELT test, recurring ADs, etc. Not just a screen alert that time is close.
On dispatch, I would like to provide a mini-airworthiness summary including dates or tach time when Annual, 100 hr, ELT battery, Pitot Static, recurring ADs, etc. were last complied with and are next due. The dispatch sheet could have blanks for the instructor or renter to provide ending Hobbs and Tach times, and comments.
Karina Carman commented
It would also be nice to be able to place any "flags" that may have been overridden, or warnings, on the dispatch sheet. Our school has a lot of flags to make sure we have the information we need, such as a current passport, medical, certificate entered/updated (if they just passed a private checkride), current insurance, etc. Currently, our ground support is writing on the dispatch sheets, but it often doesn't get on there, and after the screen passes, you might forget what it was to begin with.