If you're going to be going into PCB making in a big way, Kepro makes a very nice PCB shear that'll handle up to about 12 inches width. Of course, it costs around $400, but it's what I used the most since our school could afford such nice things.
At home, I've use a hacksaw blade cut and ground to fit my old 1950s Craftsman scroll saw, but as mentioned, fiberglass eats up such blades fairly fast, but it wasn't too bad.
I like the idea of making a tiny little table saw using the Dremel cut-off wheels. That would make a nice project and a good use for a Dremel flexible shaft. You just have to be careful of side thrust so that you don't break the fragile little blades. Danged things cut right through steel nails but break into a million pieces if you drop them.
Scoring works OK for phenolic but fiberglass isn't so easy to work with like that. Don't forget to wear breathing and eye protection whenever you generate the fine fiberglass dust that results from machining the stuff and have the propensity to shatter bits and blades running at high speeds.
Dean