Hi Jeremy;
Glad you like the timer thingy... Though I really can't take credit for it. Randy (Stuka) is the one that found it.
As for the power measurement idea - there are a couple different things he can do. If he can get into his projector easily, he could simply block off the beam from the other lasers. But that's cumbersome.
He could also change the color to RGB rainbow cycle, and then take the color speed down to zero when the correct color is being displayed. He'd have to go up on the color speed and then back down to zero to select the next color.
You're right in that any pure abstract will work, but the default waveform is a sine wave, so that's going to give you a circle. Note that this trick won't work unless you're outputting a constant abstract, however. (This leads me to believe that abstracts based on ILDA files won't work, and I know it won't work for regular ILDA files that aren't abstracts.)
I remember Bill talking about how blanking is handled at one of the FLEM's, and he said that the only way to get an accurate power measurement is to create a circle in the abstract generator and reduce the size to zero. However, he may have been talking about the most obvious case, so it may be true that a square or triangle wave will give the same result.
Adam