This is normal expected Hijack behaviour. Isn't there another button on the KW remote for "mark" as well? I seem to recall that being the case, but my KW remote is hiding from me right now.

On the Rio Remote, the "Cancel" button (immediately below the 7) is the "mark" button, even though the 4 also acts as "mark" (sans Hijack).

Of course, Hijack has evolved more since this was done, and nowadays I could easily make the "quick timer" function into a "virtual button" with no defaul mapping. Then folks could map it where they please.

Cheers