We've just posted a public beta of SkyDemon 3.5 on our Android page, which includes rainfall imagery. Please give it a try and let us know here how you get on.
http://www.skydemon.aero/start/beta.aspx

The way we technically implement map overlays means we are not going to be putting map features on top of the rainfall any time soon, sorry.
Rainfall data is not real-time and should absolutely not be used in flight for any tactical purpose. We are thinking very strongly about making it completely unavailable during flight for this reason.

There isn't currently anything in the UI to tell when the forecast you're looking at was issued, simply because we're running out of space to display such things. We don't want to turn a supposedly simple feature into information overload. Suggestions welcome!