This seems like an undesirable way to navigate, and you can bring up the full screen information screen with the “i” button on the remote, but if you really want this behavior it should be something like this (not tested fyi)…
<keymap>
<Videos>
<keyboard>
<return>info</return>
<return mod="longpress">select</return>
</keyboard>
</Videos>
</keymap>
If you don’t already know where to put that see this thread…
As for the select behavior setting I think the disparity your seeing is that setting being for a media items and not for folders.