Hi Simon, MoI has been specifically designed to avoid floating palettes because on a regular single monitor they have an annoying property of overlapping onto and obscuring the 3D workspace.

So I'm sorry but your request is unlikely to be implemented, it's something that I ruled out as being undesirable all the way back at the start of Moi's design.

However, in the future I do want to put in options for putting the entire side pane on a specific monitor though.

You can also install a startup script that will separate out the palettes so that there aren't any shared on a single tab control, here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=9439.3

With that installed you can have them all open as you were wishing for.

- Michael