[...]

1) The submenu is in the tools menu, but I feel it would be better in
the Document menu underneath the existing folding functions. Is this a
good idea, and if so, how to I get at the document menu (since I can't
say geany->main_widgets->tools_menu)?

In general its not a good idea to hide your menu items in existing menus, users don't know where to look.

2) I didn't set the keybindings since it's not recommended as it may
interfere with existing ones. Is there a way to set them if the given
key is not in use, or is that a bad idea?

How do you know that the user hasn't defined this key for the *next* plugin to be loaded after yours, the loading order is not defined? No, bad idea.

3) In the actual folding code I used sci_get_fold_level (and a couple
other scintilla wrappers) which aren't in the plugin API so I gather
my plugin may break at some point. There doesn't seem to be a way
around this for what I want to do. Is this ok?

No, as you say the plugin may break in the future and it won't work on windows IIUC. Ask on the dev ML for what you need in the API, it may be able to be added.

4) Is there another plugin out there that does this? I couldn't find one.

5) Would geany-plugins accept another plugin?

As Steven said, if you commit to maintaining it, most likely.

Cheers

Lex

Thanks,
Peter O'Malley
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