These are excellent questions!
1. Is there a search feature? I can see it exists in the plugin, but not in the hosted version?
The search feature is not yet available in TubePress Express; it's only available in the downloadable versions of TubePress via shortcodes. However I can tell you that one of our highest-priority projects right now is to build out the missing pieces of the options GUI in all versions of TubePress. This will include interactive search, multiple video sources in a unified gallery, and a few other features that are currently only available via shortcode.
I don't have an exact timeframe for when this will be done but I would estimate in the order of a few months away at the most.
2. If I wanted to build a custom front end, say a calendar, so that clicking on a date would perform a search for videos on that day. Is it possible to sent a dynamic parameter to Tubepress Express to return a set of results (effectively another search).
This ties in strongly with your first question, I believe. Once we have added interactive search to TubePress Express, the scenario that you described would be very much how searching would work.
3. I see that your plugin (and hosted product) only work on playlist or user. Is there a plan to extend this to a YouTube Channel?
For our purposes, we generally use the term "channel" and "user" synonymously. So you can currently use TubePress (of any variety) with YouTube channels by using the channel name instead of a user name. If you are having any trouble in that regard, please don't hesitate to let us know.
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