@LaFayette Well, that was really more on the side of the user, as it would be the one adjusting the right bar wideness, but I've no idea if it is an easy thing to do or not. For example, the optimal size of the buttons is probably not the same if you are on a full hd or on a ultra hd, but of course there are many more items that go the same way, so I guess it's consistent.
What the mapmaker would gain is the ability of setting a minimap dependent right bar wideness independently.
Minor note, I would actually distribute the buttons this way, left to right:
Previous-Next-Skip-Sleep-Alert.