I have a suggestion for a future version, unless you already have a solution.
Mouse gestures often work, sometimes not, probably when I don't do exactly the right gesture (but I am sure that my gesture was close).
I just created a Scrivener mouse gesture to add a bookmark in the document I am working on.
After working in a few documents, I noticed that sometimes the gesture worked, sometimes not, and I have to retrace which documents I 'missed' which was quite an effort.
Suggestion: I would be nice to have as an optional feature some kind of feedback message display, even if it was just a generic message like 'mouse gesture command triggered' to let the user know that the macro was implemented.
I suspect that other KBM users will have similar problems.