Check out
Interlux's "How To" Section. I have been reading about painting as well and found most members on a few forums have great respect for their products.
Non-slip floor, sure, no problem. Add white sand to the paint - same thing. I did this once when repainting a fish well cover about 2 feet by 6 feet last year. The texture was the same basicly. If it's too rough after using the sand and paint combination, give it aditional coats without the sand.
One step paint, sure take a look at the link above. They use the roll and tip method. Watch the videos.
Good luck and post BEFORE and AFTER pics!!!