>>4351470>Dunno if this is a well known techniqueYes, it's called multisampling and some other things. I have my Nikon Scan set to 8x on all my presets. 4x would probably be enough for majority of film I scan, but I got time and ocd. Anyway it does help average out the digital noise from the scanner.
If you're "scanning" with a DSLR then yeah, that's also a thing, though I mainly only used it to stack images of the moon.