You can stick the composited shots onto their own tracks, and use parent/child relationships so that the composite mode doesn't apply to layers below.

I've been asking for compositing modes on the event level since V4.
It just makes no sence (to my brain) to make a whole track, say, Overlay, when all you needed that for was one clip. Now the whole rendering process is slowed, as I understand it - and the rest of that track is "wasted" (ie: can't be used for other "Normal" events).