I use keyboard shortcuts a lot in IDEA. (Thanks for supporting them so well!)
I can't get Ctrl-Shift-F4 to close a Run tab in 4.5.3. This was fine in 4.5.2. Right-clicking the tab shows Ctrl-Shift-F4 against "Close Tab" in the popup menu.
Incidentally, it seems like the behavior for underlined mnemonics for menu items changed somewhere between version 4 and 4.5. I used to be able to press Alt-C, S to show CVS history. (S is the underlined mnemonic for Show History in the CVS menu.) Now, when I press S after Alt-C, it activates the top-level Search menu. This isn't right, is it?
(Wellington, New Zealand)