Dard Divorce illustrates my point...
MovieMeter
Amazon DE
And there's an even better one at
MoTech Posters, that would have to be added manually.
Perhaps
Dare to Love illustrates yours—MovieMeter has posters not available elsewhere. They're poor quality, but better than nothing.
But I note both of these are bad direct-to-video movies. The fact MovieMeter may have bad posters to go with them doesn't make a strong case for updating the plugin. I'm sure that doesn't mean nostra won't do so when he has time, or the plugin needs to be updated for some other reason. You're right, modifying it do so should not be difficult. But I wouldn't expect it to be considered a high priority.