1. Ah, this is a Google browser thing – the gap comes from the address bar disappearing. I’m looking into a fix for this.
2. Yes, this is intended. It’s a bug in iOS when the keyboard is shown and a sticky element is present. Super annoying (you can find tons of pages on it by Googling “iOS sticky keyboard”. Scrolling to the top is the best I can do for now to fix it.
3. I can’t give a specific date, but I’ll try and get it worked into the next version 🙂