OK. To get the alt+control mouse drag to work, you have to have the number lock off. I don't know why. I did not think about it until just now, as I use a few Motif apps and motif typically isn't happy with number lock, so I have it off by default.
Also, you can edit your ~/.icewm/preferences file and change the line:
to a different combination, as alt+F7 is a reach
Be sure and uncomment the line after you change it. If you're like me and don't use the system menu button on the window frame, you can switch the
for the KeyWinMove sequence, as alt+space is much easier than alt+F7.
Hope this helps.