I think it's just a panic reaction by a mod who sees someone using an external program to aid in their playing of a game. It's not an entirely unreasonable first reaction, in my opinion.

From a theoretical standpoint, keyclone does little more than an operating system (the client part of it, anyway). After all, the front-end of an OS is nothing but a glorified way of routing input to programs.

The OS provides substantial benefit to multiboxers on the output side too. It's hard to argue that keyclone makes someone more capable of botting than say... windows does.. afterall.. windows lets me keep all these WoWs applications running smoothly at the same time. And the nvidia drivers let me organize the output in a useful way.