Reg. the shapes: I am working on an improvement in the high-prec-coord branch, but this is work in progress
and up to now it only improves a few buildings and the img size if parm --x-merge-shapes is given.
Anyhow, we have the low precision in the Garmin format, so don't expect to see the small features in the piers.
Reg. the roads: Please check the results in the high-prec-coords branch. The roundabout looks much better.
The interupted roads might also look better in the branch.

Ok I will check the branch.