The existing export for HTML5 website is already suitable for iOS web apps. Generally you don't want to take anything away either (like ogg or WebGL support) so your web app can also work as a web page for browsers, and also in case future versions of iOS support it.
Yes, but it's limited because it's only for desktop, not mobiles.
Sometimes i edit HTML to add meta tags, home icon, functions, etc. when i try to update the game, i need to redo meta tags, home icon, etc. is still annoying, do you agree?