You can also run heavier rate spring....FYI, in Hi-Capa's case I am running the Airsoft Surgeon recoil spring(as-is) in the Limcat and its heavy enough that the blowback force cannot overcome the spring rate to go to full stroke. But you can pull it to lock...personally I find that is easier to show safe and still get the desired short stroking effect...
What else can you call the speedholes? Homer Simpson used it means its now in popular domain...