They have switches (and dimmers) now. They want to replace switches with controllable switches. They want to not see the new switches.
The only proper way to make the switches disappear is to relocate them or replace them with centralized lighting.
Moving them down low or covering them with wall plates would be like mounting outdoor Sonance speakers to the beams in the ceiling instead of using in-ceiling/in-wall speakers.
Avid Stamp Collector - I really love 39 Cent Stamps