Installer manifest for database drivers

Hi,

I'm trying to add a database driver to Joomla 1.7, but I don't feel like copying the driver class into /libraries/joomla/database/database/ manually.

From the JDatabase::getInstance() code it looks like that the path to the drivers is hard-coded, so I thought there might be a way to add the drivers to this path via a installer manifest file, but from what I can see, you cannot "escape" the path where extension files are supposed to go.

Does anyone know a trick or a straight way to get the driver file into place (and not having the update procedure remove everything from the joomla library folder that isn't in my manfest file)?

Thanks a lot!

Martin