To those requesting mark as (un)read. I found the API to do it (yes, it's actually in the JSON API, hidden away in SetXDetails (where X is Movie, Episode, TVShow or MusicVideo) as playcount parameter). But as I've been working on the app for two weeks now every evening and mzanetti has still some merge requests to look into I'm going to slow down and am not going to implement it right now.

I've also looked at Kozzis youtube video of the remote app for some TV brand. And indeed the overall usage seems pretty nice and I've already got some ideas to implement this in a future version. I would like to add the keyboard as a second page, and as XBMC Frodos JSON API will support receiving every user definable action I would like to add some kind of user definable page with custom buttons, so you could make a page with your own set of buttons and actions.

XBMC Frodo will also get a lot better input support. It's going to be possible to send texts in one go using the JSON API. Also XBMC will notify all apps when the virtual keyboard gets opened. This will make it possible to automatically open the virtual keyboard on the N9 to type the text. The notification of XBMC also has a type for keyboard/qwerty, numeric, date, time, ... so this makes it even possible to display the right input type. Got already a proof of concept finished and gave some feedback to the XBMC devs to refine the API.

I'm also planning on doing some contributions to the JSON API of the PVR builds (from Lars op den Kamp) so the PVR related things can be handled better in the remote app (page with the numbers, program up/down button, channel listing to select channel from, recording listing, ...)

But nothing concrete yet on these new features and I didn't discuss most of them with mzanetti yet. They're just some ideas I've had on improving the app and they're still open to input of others.

Edit:
Seems like I spoke to soon about (un)watch as the needed methods are only present since the May git code which means it will only be present in Frodo.