I've used 100% standard MK-type make/break switches, wiring brown/white to what's marked as common, and brown to live. The WebBrick Controllers can trigger their chosen action on make &/or break, so you've got an instant two-way switch, if you want it! In a cupboard, I did just the same, but used a "dwell" such that the cupboard light won't ever stay on more than 2 minutes.
And for scene selection, people have most commonly used momentary-make type push switches, in pairs, either for up/down, or some use one to choose the "off" and then use the other to step through the scenes - most people don't have more than a handful of scenes. Of course, you can put as many buttons on a backplate as you wish.
I've also used rocker switches, wired just as above, white/orange & white/green to common, green to "up" and "orange" to down. This was good for opening & closing windows.
And if you'd like, you can use a rotary encoder, to "dial" the scene. (And with the WebBrick Gateway, you could use the double-clicking of the on/off part of a roatary encoder to toggle the WebBrick Controller between scene mode & dim-mode)
You could use the WebBrick Controllers infra-red capability with a remote control, to choose your scene by number.
So you can design just about anything that "tickles your fancy" - we've even had discussions with customers about re-purposing a 1950's style Roberts radio front to dial "The Light Programme", using genuine RAF Spitfire parts, or taking magnetic fruit out of fruit baskets to set the house to "vacant" or "occupied"
As someone once said, "limited only by your imagination!"
-- Alistair