Tvheadend

Hi,

I am very happy with Tvheadend...except for the terrible time-picker UI widget I have to use whenever I schedule a recording (the one attached with this message).

I'd like to fiddle with it and possibly replace it with a more user-friendly plugin (in case it was easy to insert a good open-source widget). But I don't even know where I should poke my nose.
Reading the code, I got lost in src/webui/static/app/dvr.js, then in the JSON replied when requesting /api/dvr/entry/class over HTTP, then in the DOM structure of the webpage.
I never actually found the piece of JS responsible for displaying this widget. Is it even a part of TVHeadend? Or is it buried deep into some framework (e.g. extjs)?

I did not find developer documentation either (maybe I did not check at the right places though, because there seems to be some doxygen markups here and there, but how to generate a doc out of them?)

Any help would be appreciated!
Thanks