Digizz,
Yes I do occasionally. It's the classic bit of wood with angled saw cuts. I fix it to the table using the mitre guide slide (that is just the tee cross-sectioned metal slide, that has a handy screwed hole in it) . This does not lock the slide to the saw table but it generally stays where I want it. If not, it needs surprisingly little pressure to make it stay put - I use a finger or masking tape.
I have tee shaped slots on my saw and for various things (like my cross cut sled but including a featherboard if I could be bothered) I make up tee shaped runners by rebating the edge of a board on both faces, then ripping off a strip of the right thickness on the table saw.
If you use a bolt with a countersunk head in a hole with a couple of longitudinal saw cuts intersecting it , you can make the bolt pull up and expand the runner, thus locking it in the slot - Can be applied to featherboards and all sorts of stuff you want stationary in a slot