[ingo] Hook for filter rules?

[Ob Noxious]

Hi,

I need a way to define a hook for a particular case.

When a user creates a rule and uses the "Deliver to folder..." action, is
there a hook that one can write to avoid using the text input and instead,
display the IMAP folders hierarchy?

It would be very useful for most users as they often produce a lot of
spelling errors when writing down their own folder names.

They get confused because "they can't find their mail" and of course they
blame the mail service as usual. They also have trouble to simply use a
slash ("/") for nested folders.

Thanks for any advice :)

-- 
ObNox