For KeeperFX there is an
ingame command to capture video. And if you don't like the changes of KeeperFX, I just uploaded
a patch with which you can revert all the gameplay changes.
Well the questionable ones anyway. There are still differences, rival keepers now train their minions, your workshop won't get filled up with crates you cannot place, level 10 creatures are no longer broken. Those are valuable bugfixes though, and even most of them you can get back by enabling classic-bug mode(also included in the patch, off by default).