It looks like I am alone here, but I put my insert very close to the back of the table so that I have more support for larger pieces. I can also put the fence on the other side of the insert if needed for a routing operation other than on an edge.
In my opinion, a mitre sled works better than a mitre track, as you are guaranteed that the fence and sled are at 90 degrees even if the fence is not parallel with the table. Also, the sled acts as a backer plate to help eliminate tearout. I usually just use a 6-12 inch piece of mdf scrap that I have squared up as a sled. I just hold the piece against it with one hand and use the other hand to push. Not very fancy, but very cheap and very efficient.
Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.