It would help productivity a lot if the debugger was able to accept labels on Memory->"Address" and on set-breakpoint.
On set-breakpoint, the use-case is when the user is developing a new code: In this case, the labels change their address frequently. With the fixed-address breakpoints as they are now, the user ends up with an openMSX containing a lot of old/misplaced breakpoints of each time he tested his code.
Also the user needs to consume time checking the PRN file to manually re-add the desired breakpoints on each time he tests his code.
Both "Set Breakpoint", "Main Memory Viewer->Address" and the new Goto window now support addresses given as numbers with pre-/postfixes and labels.