I couldn't see whether this has already been suggested, or whether it should come under support rather than ideas, sorry!
I find it really annoying that I lose all my boosters if I have to delete and reinstall a game because of connection problems etc. I know this is because boosters are saved to the device and not the account so they can be used if playing offline but to be honest, I would much prefer to have them saved to the account. Maybe we could be given the choice whether to save boosters to account or to device.???