It is actually only a simple boolean value in directors prefs.
I am now on another machine and I can see, that the values are different. I've written a small shell script now, which should care of these issues. Please be aware of the fact, that setting the panels to non floating may cause unexpected results.
especially in conjunction with grouping the panels it may lead to errors. I suspect for more proper implementation one would need to investigate further, if there are settings which windows can be grouped with which windows (I think so...) anyway download and unstuff the shell script with:
curl [farbflash.de] | ditto -x - toggleDirectorPanels ; cd toggleDirectorPanels ; cat Readme.txt
chmod 755 toggleDirectorPanels.sh
./toggleDirectorPanels.sh "Object Inspector"
./toggleDirectorPanels.sh "Property Inspector"
Please note, that this is not anymore necessary when using Director 11. There is now an option in the upper right "Panel group menu" to toggle the float state of every window.