I just got the demo....While "playing" with the program and creating an 'AD' for 'user' I tried to add this code in the "description" area [this code is generic but you'll get the idea I'm sure]
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<object classid="clsid:d27cdb6e-ae6d-11cf-96b8-44455354000 0" codebase="http://download.macromedia.com/pub/shock wave/cabs/flash/swflash.cab#version=7,0,0,0" width="400" height="300" id="Untitled.swf" align="middle">
<param name="allowScriptAccess" value="sameDomain">
<param name="movie" value="Untitled.swf">
<param name="quality" value="high">
<param name="bgcolor" value="#ffffff">
<embed src="Untitled.swf" quality="high" bgcolor="#ffffff" width="400" height="300" name="Untitled.swf" align="middle" allowScriptAccess="sameDomain" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflash player">
</object>
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Of course it did not work. SO I added it (as admin) to 'users' AD in account data using 'source' button in FCKedit. I could see it in the "admin" account data area but after I "submitted" it did not work on 'users' AD

Will I or users be able to add a little code to see .flv or .swf ("local" or "external") the description are of users AD?

OH and one more thing! Can I change weight and height from metric to SAE i.e. KiloGrams & CentiMeters to (pounds) LBS & FT (feet) ?

Thank you

It is not allowed to add this kind of code in the AD, because could open a security issue for shared server and in many place mod_security will cut it down.
A regular user will not know this kind of code and an expert user will be considered by many server admin as a harmfull code and will dissalow.