Item Relations show Thumbnail

I would like to utilize the item relations plugin, but don't like the current way it displays on my item show pages.

Is there a way to display the related item's thumbnail as a link to its show page, rather than its title as a link?

When I have multiple relations, but only one defined relation type, is there a way to list all similar relations under the one type?
i.e.
This item is related to: 1, 2
rather than
This item is related to: 1
This item is related to: 2

There is no simple way to do what you ask. You'll need to use the plugin's API to customize your theme, which requires a working knowledge of PHP and familiarity with the Omeka codebase.