If my cursor is on the name of a tag I want to jump to, I can use Go to Tag Definition to get there. But if I just happen to know the name of the tag I want to find, currently the Geany interface has no place I can type it in to jump there (as far as I can tell).
One way to solve this would be to have a Go to Tag... command that puts up a dialog where I can type a tag name. A better solution would be to have the Symbols pane list all symbols in my entire project, and have a text box at the top of the pane where I could type any tag name to narrow down the list of symbols displayed.
You should try the project plugins too see if they do what you want.