Distribution of the dimension lines would be very nice indeed.
I am not really sure why it can't be done (there must be a reason though) as you can simply manually move any dimension line towards or away from what it is dimensioning without affecting any of the dimension settings or what it is associated to.
One of the forum moderators.
Versions 6.5 to 25
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Dell Precision 3510 - i7 6820HQ @ 2.70GHz, 16GB RAM, AMD FirePro W5130M, Windows 10