When you find a song in a Playlist, you can't Load it. That's correct.
The purpose of the 'Search' button in this window, is not to Load a Registration, but to append it to a Playlist.
I would like to see an extra button there to Load it right away...., maybe in the next update?
So what you can do instead:
Make a playlist named 'Now playing' or 'Temp',
Make this the current Playlist by opening it,
Use the Search button to find a Registration,
(Genos performs a search in ALL playlists)
Highlight the result(s) and touch 'Append Playlist to append it to this Playlist,'
Now you can Load the Registration,
When closing this window there's no need to save it, so you can use this Blank playlist to quickly search and load Playlist items.
Cheers,
Stijn