This is a side effect of the client / server architecture when running without a Recast server. When the console is launched, a new process "Right Click Tools Desktop.exe" process is started as the Recast "server" process and stays resident to handle any Recast actions. This process will not close with the console, so if you launched the console as a non-administrator user, then closed and relaunched the console as an administrator, the "Right Click Tools Desktop.exe" process will still be present from the first console launch and will not have administrator permissions. Because the Recast tools detect that the process is already started, it will not try to relaunch the "Right Click Tools Desktop.exe" process, so any actions you run from the elevated admin console will be sent to a non-elevated process. If you kill the "Right Click Tools Desktop.exe" process and relaunch your ConfigMgr console as admin, your Recast tools should have administrator permissions on the local box.
I just uploaded a new version of the 3.0 beta that I believe will fix this. Now the 3.0 version will monitor the ConfigMgr console process and when it closes, the Right Click Tools Desktop.exe process closes, so you shouldn't get to a scenario where your ConfigMgr console is launched with UAC but the Recast server process is missing UAC. If you want to try out the 3.0 beta, you can download it here: http://nowmicro.com/software/recast3beta