Thought this new feature was worth upping the version and making a new topic.

Anyway, the new feature is auto download and playback. You just get the score details from the high score list for the game of your choice (double click the score as per usual), and click the 'Download and playback' button, and of it goes. It will search for the version listed in your version list, but if it's not found, it will use which ever is the currently selected version.
Now, this also means that the format of versions.ini is a bit different, with an extra field for the version name (should match what MARP uses, ie: 'mame61', 'mame58'... It is this field (it should be the third of the now four field for each version) that is used for the version search. See the included example ini if you're still not sure how it should look.
Have fun.

EDIT: Updated version, fixes problem with uppercase INP filenames.