It's a real pain to get a gap in a thin wall to fill. Free, open source programs have solved this issue. Simplify3D should be able to use a thinner/thicker extrusion as necessary to fill gaps in thin sections (as an option). So many models I can print just fine in Cura that just can't be done in S3D. Disappointing.
A feature that would be cool is an ability to print multiple layers on an island before travelling to another island. Printing, say, 2 layers on one island of the job before traversing to another island would already cut stringiness, blobs, etc in half. Printhead geometry on almost any printer should allow for several extra layers to be printed on an island without risk of tool crashes when printing the next island. This would be extremely useful for multi part prints. Parts would print faster and cleaner.