platformVersion isn't being honored by the selenium grid

[kappa10j]

I've specified the platformVersion as a random number so that I can use that to choose which node to use. I'm doign this because I need to create a session on the desktop, launch a clickonce app, then connect to the app. To connect to the app, I need to create a new session but the grid will select any node that matches the capabilities. Therefore I need someway to specify a node. I tried using guiid but that wont work either. Has anyone come to this kind of issue?