[steven]

How about a lateral pinch to flag, and an un-pinch to unflag?

Still gesture, without agitating folks about the pure swipe interpretation.

On a line item:

---------> this is a swipe

----> <---- this is a line item pinch (flag)

<---- ----> this is a line item un-pinch (un-flag)

just a super-fast idea from me while browsing forums; maybe too hard for some.