Initially when i read this, i thought it was a mod to make static GI's into flashing ones, but i had to re-read it a few times to realise what it's meant to do (my initial thought would be handy too).

The output opto-triac is a limiting factor in what you hookup, anything (mod) that draws more than 400milliamps will kill that opto output.

I built similar things to this years ago, although i use the lamp & switch matrixes to control external mods.
The addition of some beefier Triacs/Mosfets to the above mod would be a big help.

my 2c :-)
MM.