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Probably you shouldn't be able to invoke Tools | Add To Palette and Properties on the nodes in this and similar dialogs.
Generally there are a bunch of UI problems in these checkbox explorer tree views - clicking sometimes selects, sometimes toggles the checkbox, sometimes both, keyboard navigation is a bit odd. Probably we need a component in the explorer API to directly do checkbox trees right. Note that quick search *is* useful (except that pressing space to check a checkbox invokes it - which should probably just be fixed in explorer).
I can fix the actions problem. For the click problem either specify what is wrong and how to reproduce or it is hard to fix. For the other issues/RFEs file bugs against core.
Fixed by saubrecht.