Fix { "trailing_spaces_include_current_line": false } so that the hilighting of current line is toggled off only when you start editing that line. Or even better, only when start editing at the end of line.

This way, when manually deleting trailing spaces, the hilighting would not disappear just when you're about to delete it (because of entering that line).

When fixed, make { "trailing_spaces_include_current_line": false } the default.

Btw. instead of providing "a lot of options to fine-tune the way you want to decimate trailing spaces", I'd prefer to not have options, just sane default ones :)