Floating from Slide to Lyons, even if you're not fishing from the boat, is not specifically prohibited but its generally viewed as a no-no by regulars. There is a movement afoot to get the fishing regs changed to address this.
You referring to the new proposal to open the Slide/Lyons stretch to a year-around season, instead of the standard 3rd Saturday in May opener? My friends on the river are very much opposed to this, as this is THE prime rainbow spawning water on the upper. With all of the trouble from whirling disease, I'd also vote to give the 'bows a break.