Currently the only available click installer extensions for PHP are "imagick" and "Gmagick".
Would be awesome to have more extensions available for single click install.
Currently you need to SSH into the server to do a "apt-get install" and for users that do not have allot of experience with it that could be a little dawning.
For me currently were:
- sqlsrv / sqlsrv_pdo
but I could figure other users might need more one clickers :-)