That's right. But, you can still put backgrounds in channel windows using this:
/background [-aemsgdluhcfnrtpx] [window] [filename]
Changes the background picture setting for a window. This can also be changed via a windows System Menu.
-a = active window
-m = main mIRC window
-s = status window
-g = finger window
-d = single message window
-e = set as default
-cfnrtp = center, fill, normal, stretch, tile, photo
-l = toolbar
-u = toolbar buttons
-h = switchbar
You can right-click in the toolbar/switchbar to pop up a menu for changing these settings. Toolbar buttons can use RGB Color 255,0,255 for transparency, the BMP must be of the same form as that in mIRC resources. It should be a 16 or 256 color BMP.
-x = no background picture
Note: The window name should only be specified if none of the window switches are specified. The filename does not need to be specified if you are only changing the display method.
