Currently no support for Dashboard libraries/events (Jscript). Also, it would be useful to implement an object model for cross-entity data pulls and for data pulls not based on an existing form. There does not appear to be a quick/easy way to extract say user-level attributes when using dashboards (context driven). So while you can add an I-Frame with something like a custom web page or an SSRS report, there is no EASY way to fetch a value from a specific entity/instance (like current logon user) and use that retrieved information to pass as a parameter to an I-Frame. It does not appear that the standard Xrm.Page object model can support such cross-entity pulls when starting from a Dashboard.