Inline editing is pretty much on the heart of Joomla and that is the direction in which they are heading. Wordpress already has that feature in spades but Joomla has no support for this until we implemented a system to bring this much wanted feature to Joomla. Since we are not core Joomla we have to modify Joomla's CMS platform to implement this functionality.
We have done numerous testing with various mainstream template clubs such as Joomlart, Yootheme etc... And we have made sure to test with them so that we most of them they will be no conflicts. I say most and |I wish it could be all of them but we cannot control what they do for they designs and since they are not aware of the concept of inline editing we cannot guarantee that they will be a conflict with a particular template. So if there is an issue we will look into of course so if you can provide us with the CSS rule that is causing you issue we will look into it. We are looking to work with template clubs for direct inline editing support so this should keep any possible conflicts with a particular template to a minimum. And also in the future we will be looking to provide templates with inline editing support built in.
Our editor is not just an editor but it is providing you with the frontend inline editing framework for Joomla.
We will be releasing shortly documentation for third party extension developers and that includes template builders on how to integrate inline editing directly into their extensions. Currently we have support for Joomla core Article Manager out of the box and extended this for ZOO and FLEXIcontent with K2 to come in the future.