Slic3r just had “avoid crossing perimeters” merged into the main branch. This means that the nozzle will travel around holes, etc instead of crossing them when possible. If you run from the repo, it’s a good time to update. 
https://github.com/alexrj/Slic3r/commit/a016a06fa604193bafaa9417a78834f17338c59a
Also, there is new version of geometry library that slicer uses that is way faster. Yes, good time to update.