I can't for the life of me figure out how to do what I thought would be simple:

How do I set up horizontal slider buttons (2D graphics) to be controlled by the user to control scaling of an object?

I can't find any scaling commands in the interactive menu. Also, I am not sure how to set up the slider buttons with definitive "stops": basically, the X coordinates that mark the far left and right ends of the slider travel.

Use Flash sliders and have them communicate with the VET scene using messages and VETScript.

Thanks for your help, and for the info you sent me via PM. I hope to have a go at this soon.