This question is so ridiculously timely! I actually just finishing giving the Super Customizable CFD app a makeover and I think it should support all of your use cases now.
The new version should probably be available in-product in the community app catalog sometime next week, but if you'd like to try it out now you can always just grab the html from github and paste it into a Custom HTML app:
super-customizable-cfd/App.html at master · RallyCommunity/super-customizable-cfd · GitHub
The app should now respect being placed on a timebox scoped custom page- iterations, releases and milestones. And there are a bunch more ways you can configure the timeline for your chart- you can either configure it to use the timebox dates for start/end, use today for the end date, or use specific start/end dates.
Give it a spin and let me know how it goes!
As always, any issues can be reported on the github issues page for that app:
Issues · RallyCommunity/super-customizable-cfd · GitHub
Cheers,
Kyle