I just uploaded csshX v0.60.
Main new feature is draggable bounds changing. This allows you to resize or move your window set after it has been opened. Bounds changing is accessible using Ctrl-a b. Once you select the new area for the windows to use, press Enter to accept it.
* Note, dragging between Spaces on 10.5 does not work. I cannot find a way to ask a window which space it has been moved to, nor tell another window to move to a space.
You can also now hide your window (rather than minimise them) with Ctrl-a h. This is much faster than minimise, and I find Ctrl-a h, Apple-m is a great way to clear my csshX screens away temporarily. Window hiding has also allowed me to improve the retiling performance.
Other changes are minor, including one fix to the nasty infinite loop bug when using enable mode selection.
As always, please report any issues you may come across, preferably on the issues page.