Date: 5/10/2008 0:40 am EDT
If the substrate is "plane" as it should be I don't see a problem with adding the cuts assuming you still have the tabs in place on the adjacent full tiles.
If the substrate is not plane...
I'm not sure what Avaire would recommend but I personally would use an adhesive for those short tile pieces in this case. Adhering those few short pieces to the substrate at the doorway would gaurantee they wouldn't move if the substrate is iffy at that location.