We have created many VBSCRIPTS to permission directories, you could do the following using the XCacls. See sample script below, you will need to create a custom action and add to the install sequence.
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Function Permission()
Dim wsh
FileName = "c:\program files\nokia\nokia pc suite 5\synchdata"
Set wsh = createobject("wscript.shell")
Permission = wsh.Run ("XCacls " + Chr(34) + FileName + Chr(34) + " /t /e /g users:f /Y", 0, True)
End Function
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This will give full rights to the directory for all users. Replace c:\program files\nokia\nokia pc suite 5\synchdata with your directory. See screenshot for example on how to use vbscript, we use stored in binary table option and run after installFinalize