Phantast, one option for faster switching is to go to another folder that you don't use very often, which is often only one click away from the top of the hierarchy.

I generally use Expressions, but Hands, Cameras, Lights, or Hair (if you've got hair mostly organized in its own runtime) can also be used.

Although I do agree that the Poser library palette is rather annoying to use sometimes, maybe EF will put an easier-to-navigate one in P7 since the current isn't all that conducive to multiple runtimes having been designed before the option was around.

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If you're joking that's just cruel, but if you're being sarcastic, that's even worse.