Persistent watches :
   watches should be persistent at least between runs
   better could be persistent watches even on ide restart
   the best would be watches (and other debug stuffs) stored on a user file

Persistent breakpoints :
   the same as previous point

Conditional and passcount breakpoints

Stack dumps on request
    useful to trace code calls

Better variable evaluation :
    Evaluating r of type 'Rect &' should show r contents, not r address

Class/struct member following :
    Classes/structs members should be clickable and fields opened as new watches

    a way to embed external html help files (with indexing maybe)

code reformatting
    I could try to add it myself, with some help...
    I've already done something with AStyle package elsewhere