The dreamweb engine for scummvm has some cheats: ctrl+f (4x speed), ctrl+g ("turbo"), and ctrl+c ("skip statue puzzle"). The first two are not present when running the game in dosbox (i.e., from the original exe). I have not tested the third.

I thought I'd mention this in case someone stumbles on to these keys and thinks they're a canonical thing.

Reference:

https://github.com/scummvm/scummvm/blob/b5571cc089ba63f653c33c26bafbee46323ad818/engines/dreamweb/dreamweb.cpp#L322-L337