I think this is something that ST should make themselves. Honestly making a PWM dimmer for 3(or 4) channels would be so easy with off the shelf LED drivers.
Personally I would love to see them do the same thing that WigWag did and add a small PIR to the controller so that it can act as both a sensor and a dimmer. That way I dont have to buy two “things” to do a simple task like turn on these under cabinet lights when I walk in the kitchen to get a drink of water in the middle of the night.
http://store.wigwag.com/wigwag-glowline/
…or just support WigWag sensors in ST