Is there a way to colorcode/highlight robots.txt and .htaccess syntax? E.g. with a SublimeText2 plug-in. I found this, but can't figure out how to install it: https://github.com/shellderp/sublime-robot-plugin
Use Package Control to install the syntax packages you want to use. If you're using Sublime Text without Package Control, you're missing out on a lot.
Install Package
Packages can be added and removed very easily, but greatly enhance and personalize what you can do with Sublime Text.