@TorATB i think that is a bad idea, now you just have to tap the arrow button if you would move it to a separate app it should be something like this: tap the three dots or other menu > share > select flow app which is less efficient.
i understand your idea that you want the freedom for your mobile browser. but the best way should be that opera makes a public API for flow so each browser can implement it like in opera touch.
BTW this will never happen
Online shopping and payment by iDeal (number one in the Netherlands) requires me to use Chrome, Firefox, any other browser that can launch my bank's payment app. In some shops it is even necessary to set my default browser to one of these. So, Opera, be wise and allow app-launching, please.