Been working with a codebase that uses Unicode variable names in Python 3. It's great for when I'm reading (policies are named `π` rather than `pi`!), but makes writing and debugging more difficult (kinda difficult to type `π`...). On the whole, pretty worthwhile tradeoff!

Have you tried unicodeit? (unicodeit.net) There's a good systemwide plugin for os x. Makes it easy to write Greek letters etc by typing out latex and then hitting a hotkey.