Although not really a 'cool idea', I think it would be very useful for runners with a Strava subscription to also have access to a range of preparatory/off-season training plans, such as base building plans for various mileages. The way the training plans are currently available right on Strava, have a starting date based on the race day, and are delivered every single day to your inbox is immensely helpful (and I know, they're not integrated into Strava which is unfortunate, but they're very handy nonetheless). I PRed in my 10K by 5 minutes thanks to these training plans, so I'm very in favour of them.
That's just my view on the matter. Please do let me know what your thoughts are on this and I hope it gets through to the Strava team!