If there is more than one core, such as having the arduino core and the tiny core, each has a seperate boards.txt file. It would be nice if the Tools->Board menu was split into which core a device comes from. At the moment, because of having two cores, the menu is longer than my screen is tall!
You could have seperate menu's like:
The name of the menu would be the same as the name of the core (with a capital at the start of course). So the arduino core is in a folder called "arduino" so the menu entry would be "Arduino", the tiny core is in a folder called "tiny", so the menu entry would be "Tiny".
If there was only one, it would remain as it is currently (with no subdivision)
Just a thought.