Good idea. I assume you're talking about the stuff that's a heavier version of the nylon mesh tape used for sheetrock joints. It's used to "tape over" the joints in Hardi-Backer, too.
The question is whether to try to hold everything together or let it move. With ceramic tile, there isn't much choice - it's not going to move (without cracking). If the surface has some give (vinyl, for example), I'd be tempted to use an elastomeric filler.