A request from the forum is to be able to have more control over cloud rendering. Maybe add a hook/filter to swap out the rendering class/function?
Other places for hooks/filters should also be researched.
Requests for being able to merge terms with the same name to one entry in the tag could also be achieved using a hook like this.
http://wordpress.org/support/topic/combine-tag-post-types is one example of this
http://wordpress.org/support/topic/tag-combining is another example of merging terms
http://wordpress.org/support/topic/custom-taxonomies-combining-tags is another example of merging terms
https://0x539.se/wordpress/ultimate-tag-cloud-widget/#comment-804393748 is another one
Add more filters, fixes #32