Post-install or untar installation of 00xfree.csh, 00xfree.sh?

[Harold L Hunt II]

Is there a general policy of how /etc/profile.d/ scripts should be 
installed?  Should they be indiscriminately untarred overtop of any 
pre-existing version of the scripts in /etc/profile.d/, or should they 
be installed via a post-install script?

If post-install scripts are the preferred method, would someone 
(probably Jehan) care to make a post-install script for XFree86-bin that 
is based off the post-install script for another package that installs 
profile.d scripts?

Harold