Custom Graph - Webchecks

I've made a dashboard and managed to add some webchecks to it (locate graph & click "add to dashboard")

 

However, they are very restrictive and I can't change any settings. Min / Max, etc. I'd like to create a custom graph, but I can only select "Resource" datapoints, not website datapoints. 

 

The webchecks contain very valuable information for us, because they are able to interact & login to websites. This functionality isn't available out of the box for resources, and would need significant development time to create a custom datasource to do this.

 

I'd like to submit thus as a request for an improvement/feature request? We'd like to be able to graph & report on website check data in our dashboards.