Two things that I use often are both improvised, right angle jigs and weights. For the jigs, I just cut 1 inch pieces from scraps of aluminum angle and drilled a small hole to pin it down. For weights, I filled Ziplock bags with sand and put it inside another bag. I keep five or six bags in an small plastic bucket on the back of the bench.

As far as the wife is concerned, if you keep the workbench messy enough, she'll never spot the new stuff. And I always tell the hobby shop, "Keep the slip, plain bag and I was NEVER here!"