I have a feature suggestion I'd like to make.
The easiest way to explain this is probably just to point at an example of a similar thing in a different application. In most winamp style mp3 players when you press the j key it brings up the jump dialog, this dialog provides a dynamic search of all the files in the current playlist and allows you to instantly jump to any of them. My suggestion is that Geany have a similar mechanism for searching and jumping to symbols in the current file.
This is not something I've seen in any other editor, but I think it could be very handy.