I've got some things in mind, but at the moment I'm just really trying to get used to the new system before I say I'm committing to any one idea.
Demanding examples!
One mod I am still working on is an auto installer for xenforo

It's kinda finished, but works specifically on my box. I just need to make it more dynamic.
./xenforo.sh --file:name --path:here
It checks the user permissions, the files and dirs already there, scans which ones are from xenforo and which ones might be custom.
Unpacks to temp dir after a backup and asks for db details to do a dump, and replaces known xf files with the temp ones, and if there are new files in zip it doesn't know it checks if it exists in that path, if so, asks to overwrite, .. etc. Copies over the config.php file, does the chmod for the right dirs again. And checks if the .htaccess files are in expected place. and pushes everything it does to a upgrade_log file.
A bit buggy atm, but it works. Trying to make the .php version at the same time. So users have an option.