The suppression of a particular visual, or a number of them is already possible using the following hack:

The file empeg/lib/primitives.list by default contains only the reference to the file primitives.bin where the visuals reside. If you add a list of comma separated numbers after the reference to primitives.bin and save primitives.list, you'll notice that only the visuals corresponding to the numbers you've included will be activated. The numbers can be calculated from the order in which they appear by pressing the visuals cycle button.

Note that this is not intended as a solution to the suppression of visuals, and was initially implemented for our own testing purposes - However, for those of you desperate to suppress individual visuals, a little experimenting with the primitives.list file should solve the problem in the short term.

Toby