I saw an intriguing tip in a video from author Sharon Pedersen. She uses a piece of old mat (obviously she uses the Accuquilt a lot more than most of us!) to cover just the portion of the die she plans to use. I'm not sure it's worth
cutting up a good mat to do this, but I thought it was a clever idea.
I don't think doing this would negatively impact the roller, because there is a "gap" between the roller and the die board. I'll have to take a look at this.