The biggest issue for big providers is management, when swapping from one algo type to another, changing description text on multiple rigs, and changing prices. This is manageable if having <5 rigs, but painful when having more. But even in this direction, we are already working on a solution and will soon be published.
OK, here is a solution for all of you who have Linux rigs:
So, basically I made a simple web page, actually a web wrapper to control my Linux based multi-mode rigs. This solution is only for Linux rigs (I guess the majority of serious rig providers are running some sort of Linux on the rigs anyway) and requires some Linux knowledge to properly set-up the environment. With this solution rig provider can control his rig's "mode" remotely solely with web browser.
https://bitcointalk.org/index.php?topic=471867.new#new (see the video demos)