It shouldn't be too cumbersome: tap the North indicator to show the Map Layers screen, then touch Weather.

Aren't METAR and TAF (Weather/download weather for chart/your country) an adaequate workaround? It gives you an impression and the forecast slider even allows you to predict it rather precisely. In flight weather would be great, but if you circumnavigate rain showers, you are dealing with small regional effects maybe of miles to dozens of miles size. Those move with wind speed, which is rather fast in relation to their size. Therefore, rain location from an hour ago is useless. If you want to know precisely where a front actually is, outdated data don't help you at all. In Germany, we can ask the FIS, Flight Information Service. Although they don't have the weather as a map, they have actual metars.

So for this time I support the conservative approach of Skydemon.

One thing that could be changed: you have to activeate the weather overlay every single time you are switching to flight mode. If you have to enter planning mode (to modify a route) and switch back, you loose wind and METAR/TAF/Symbols and you have to reactivate them (which is cumbersome on the Ipad).

With more than 20 years flight experience vfr/ifr i still prefer to have weather info, even it is not allways realtime. If not actual it could show this like "rain radar data 45 min old" or so. If older than 60 min - not visible. (As suggestion)
It must be clear that this is not "replacing a serious flight weather preparation"

I understand. Therein lies the problem, really; even if we simply integrated rainfall radar (which some other aviation products do, and is very expensive) people would then want the next thing, and the next thing. I'm not saying it isn't useful to have weather integrated, but there are other apps whose sole purpose it is to present weather observations and forecasts beautifully, and duplicating those apps within SkyDemon is not necessarily productive for us. The idea of real-time weather in flight is something where we could make a real difference but the technology isn't quite there yet.

Just rainfall wont be much use on own but the reality is reference is made to met data from lots of sources when making decisions. Im just advocating bringing more of those sources of information into the primary planning tool.

The idea of somebody planning around rainfall which could (probably will, in fact) be totally different when they actually take off (even if that's 15 minutes later) makes us nervous.

Yes.  Perhaps the morning of the flight you're planning to make just keep an eye on things and how the weather is developing / moving but also perhaps to help plan a route around weather.   In flight updates would be fantastic but at the planning stage it could simply be as beneficial as combining several sources of information into one place and to help give a picture of whats happening in the space between airfields with METARs. 

Yes, it could. We have considered that but we don't fully understand what use such a feature is in planning mode. After all, rainfall radar (and satellite rainfall data too) is "live" (slightly historical) and so could only potentially help with a flight you are literally about to take off on. Is that the usage you are considering?

i take your point re: safety in flight but could such a feature be applied during planning stages on the ground and disabled while navigating until such time as a reliable update method becomes available?.

No, the thought in the pilot's head that the weather data is updating whereas in reality it is not - because of patchy 3G coverage - is the worst case. And that's why we are not currently prepared to integrate radar data into SkyDemon.

Synthetic vision is cool but almost utterly useless for VFR flight.