Larry, especially with a heavier sled the T slots with an engaged washer will really help at the start of a wider cut. Something where you really need the sled pulled back to lay the stock on it in front of the blade. Say a panel cut on 12" or wider stock. Most cabinet TS's only allow about 14" of running space in front of the blade. Benchtop, and other smaller saws less.
If your runners do extend out front as Kenny suggested, they would engage the T slot and while not being hands free kind of stable, will let the T help hold the sled when pretty much fully withdrawn.
Internet maker Izzy Swan has 2 different items he markets that will help with sled or wide stock support even if you lack a T slot.
Saw mounted support leg. He calls it the "
Large material folding table saw infeed" The page has a video showing it being set up, and in use. You could opt to get his plan, or look at it and roll your own.
Also saw mounted is a small extension support he calls the
Table Saw infeed saddle Here he offers to sell you the saddle, but again watching the video you could suss out enough knowledge to pretty easily roll your own.
I never know with Izzy if he has the original thought, or if he is a great copier of ideas?