Want to make your own third-party StaSh commands? Look to Latte to help! It's a package manager and repository system for all things StaSh. If you want to make a new command that automatically cleans your Pythonista sandbox, make a package, send a pull request to https://github.com/Seanld/Latte, and your program/command will be available to all the StaSh users who also have Latte installed on their StaSh. Great, right? Now there is an apt-get for the StaSh shell!
To download the newest version of Latte, you just have to run this line of code in your Pythonista line-interpreter (the popover on the right), and you will see download progress text begin to appear, and it will tell you when it's finished. You don't need to reboot Pythonista or StaSh, the changes are dynamic.
import requests as r; exec(r.get("https://raw.githubusercontent.com/Seanld/Latte/master/installer.py").text);
To install the test package abc123 from the default repository, for example, you simply run latte install abc123. Boom, now you can run abc123 helloworld in StaSh, and your new package has just echoed back "helloworld" to you! Not very useful, but I'm sure you can come up with your own commands that would help a lot more.