Hi keyi, yes it's possible to make a floating command options dialog, there's a description on how to do it just a little bit later on in the same recent thread that talks about doing it for the side pane, here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=7394.10

The down side of the way you display it in your image is that you now have your working modeling area obscured by a window sitting on top of it - it's a big focus of MoI's design to avoid doing that and leave your modeling area to have your model openly visible in it. That's why things are not set up for floating toolbars in MoI in general.

- Michael