Scott,
All I can offer is my "guesstimate"...
In V3, I'd say no. Brian is trying hard to concentrate on V4 and adding new things things to V3 is really hard to sell to him. I had some space on the 10x7 run page reserved for horiz sliders in an earlier iteration. I opted to reuse it for other things since I didn't see horiz sliders showing up in time to be of use to MSM.
One tech hassle is that if/when they are added, it will cause a content change to the set file format, which will require the addition of a set file version and corresponding support to screen editors and mach to recognize different set file versions.... I don't see that happening at this stage for v3.
Re V4, many moons ago, he and I had an informal conversation that "back burner-ed" this control to V4. I don't have any expectation as to "when" horiz sliders might show up. There are lots of things I suspect are more important to him for V4. Therefore my guess is that this would be way down his list.
Dave
Dave,
Just got to ask, is Brian adding the ability for Mach screens to use and display Horizontal sliders as well??
scott