Custom Buttons API
Beginning in WP Edit Pro version 5.0, a new system will be introduced allowing other plugin/theme developers to add their editor buttons into the WP Edit Pro button configuration.
As a result, users of WP Edit Pro can then move the other plugin/theme editor buttons into new locations in the editor toolbars.
A detailed description of the process can be viewed on the Knowledge Base website; Custom Buttons API article.
Encourage your favorite plugin/theme developers to view the article and add their editor buttons to WP Edit Pro.Custom Buttons API