I wrote a add on library to ST_Anything for RGB and RGBW color control. Its programmed to use analog strips but could be modified to use addressable, especially if using “NeoPixel” strips. Not sure how strong you are at programming but you can check it out.
If I had a set of NeoPixels I’d program it myself but all I have is analog strips (feel free to mail me a set. 
). That and from smart things your gonna be limited to what you can do with them since each “thing” you want to do will need a button to do it and there wouldn’t be any easy way to select certain leds although doing a entire strip the same color would be easy.
Edit: I guess technically you could use two “dimmer” controls as range selection sliders for your starting and ending LED addresses and set those to a color then change the sliders and set another color and so on. Would be a little clunky and not 100% positive it would work but it might be possible. The dimmers from everything I can tell work on a 0 - 100% scale so if you had 300 addressable leds and wanted 1 - 100 you’d have the first dimmer at 0 and the second at like 33. It would take some playing but it might be possible…
-Allan