I would recommend a separate fence for the router table.
I added a router table extension to my saw. At first I used the Bies. sytle (Exacta) fence for routing, building add ons to it.
I got to realize, that, quite often, I needed to go back and rip a piece, and had to unset the fence for routing.
2 short t tracks and a dedicated fence were much better.
I bought a Rockler, aluminum/mdf fence, that had 2 faces, so you can adjust the opening, and shim the outfeed side for jointing, etc. It was around $30, but don't see it in the catalog, which just came.
I also bought a pack of their fence shims, for $5.
I usually make stuff like that, and use whatever for shims, but this was a simple, inexpensive solution, that has worked great.