I had this problem from developers who wanted to install something from a CD that required a sys password. For example, if they working on an application called RMS 9.0 and would like to apply the latest patch.

The solution is - either the DBA installs the application patch
or he changes the sys password TEMPORARILY for their install to go through and change it back once the install is complete.

For example change sys password to kris and change it back after an hour or so.