Enhancement of the "selfilter" command

[LittleBiG]

Please add a new option the "add" parameter:

add
0: [Default] new selection
1: add to current selection

-1: remove from the current selection (similarly to the [SHIFT] + [OK] in the Selection Filter...) It would be an easy way to get rid of unwanted items from a selection before processing starts.

[admin]

Good idea.