Got Questions about Roundcube

[VariaFan]

Hello !

I'm an french intern and my mission is to install the WebMail RoundCube for a web project.

I need to modify several features but I don't know how to do it or if we can do it. I would like to add these features :

• A Folder Tree that users can't delete or modify
• Several Filters like tags on mails made by admin only
• Can we add easily JavaScript

Kind regards