Hi,
I have made a Zen Coding plugin for Geany supporting 'Expand Abbreviation' and 'Wrap with Abbreviation'. If anyone wants to try it out you can find it here:
https://github.com/codebrainz/geany-zencoding
If I get any type of positive feedback, I will commit it to the official Geany-Plugins repository.
Let me know if it works ok.
Cheers, Matthew Brush