what would this feature add that cannot already be done? answer nothing. since u can already move any dialog in mirc already anywhere u want it.
Of course you can already move dialogs in mIRC whatever you want them, but since when could you drag them to the side of the window and have them stick there, as a docked dialog works with ktools.dll, and as windows docked to eachother do in winamp? You can't, atleast not without the use of DLLs.
As r0ck0 said, a better way to put it would be "being able to snap it to a docked position". Personally I thought it was obvious that that was what the orignal poster meant, or atleast that he meant they would be undockable.
I think a dialog that is "docked" to something else means that when that something else is moved, the docked dialog moves with it. That is exactly what ktools.dll does, as does winamp. When the desktop is resized docked AIM windows, trillian windows and Windows toolbars move to the side of the desktop they were docked to, undocked ones stay where they were.