I think the ESC key works for skipping cutscenes in Riven (at least when running through ScummVM). Thanks! I will try ESC when I get the chance. And to answer the original question, I don't think you can disable PAUSE-with-spacebar. It's surprising if that's the case, because I couldn't find anyone...

The game I'm using Scumm for, Riven, uses the spacebar to skip cutscenes (or at least I assume so because Myst does; I could be wrong). But Scumm overrides this into something like the opposite, a pause button. How can I change this? ADDENDUM: I'm using Windows 10, and I have give more specs if need...