You can install our site as a web app on your iOS device by utilizing the Add to Home Screen feature in Safari. Please see this thread for more details on this.
Note: This feature may not be available in some browsers.
... and convertible hard tops usually take up a lot of trunk space (or all of it), and also pretty much require the vehicle to be a 2 seater, ....
Personally I think its unlikely that there will be a retractable hardtop for the normal Bluestar. These systems are expensive in terms of cost in develop and production, and in terms of weight, and Tesla will certainly be wanting to keep both cost and weight low to meet the 30,000 price range while giving as much driving range as possible. The Bluestar is also supposed to be Tesla's "Car of the People" and convertible hard tops usually take up a lot of trunk space (or all of it), and also pretty much require the vehicle to be a 2 seater, not a family car.
I could definitely see this for a future roadster based on the Bluestar platform though.
I think this is COMPLETELY wrong. Many cars have all this on the same platform. Look at the BMW 3 series for example. 4 seater sedan, 2+2 coupe, 2+2 convertible and a small station wagon to boot !! I think all can be easily accomplished. The whole series does not have to start at $30,000 just the base model.