Yes I wanted that myself at some point, problem is it's somewhat outside the current way of doing things. You might be able to solve it by adding the cap as a non scaling static skin section.
As for the rotation center of the ends, it depends on the (auto) group. The order used is anchor>cap>point . So to force a non cap center as end center you have to add a path anchor (you'll find it in the 'misc special parts' (top level, crossed picture) part bin group)
As for the rotation center of the ends, it depends on the (auto) group. The order used is anchor>cap>point . So to force a non cap center as end center you have to add a path anchor (you'll find it in the 'misc special parts' (top level, crossed picture) part bin group)