I'm making my own white oak door jambs. So far I did one set. I milled some rough cut oak, made two passes through the table saw to roughly remove a rabbet for the integrated door stop.

Then I ran it through the table saw again with a dado stack to get the rabbet to the final dimensions. The problem is, it's difficult to apply even pressure as the wood passes over the dado stack. I already have a featherboard pushing against the fence, but I'm thinking I could use another pushing against the saw top.

I know I can put one on my fence, but that would apply pressure to the part of the board closest to the fence only. Do they make any contraptions that can apply even pressure downwards, but over a larger surface area? Like multiple featherboards extended out over the work piece.