For the item tooltips, that's not something that is really feasible because it would be constantly
in the way during normal gameplay, but we are very aware of the challenge to which you're referring. To address that, we're going to be adding a new Help button that will provide context-sensitive lists of items and blocks and such so that players can easily get information (refreshers or first-time, heh) on anything on the screen. Some folks don't even know what Fast Forward, etc, does, so we're concisely wrapping in as much as we can to that; hopefully will have that out today, we'll see.
For the items that are unwanted in item clear mode, that's part of the challenge -- seriously, that was intended, that's why those are in there.