One function I still miss in the Android version, that you can basically already use with a key combination on both Mac and Windows, is the option to ‘hard’ refresh that removes the cache from the current site while refreshing. You could add it by adding a long keypress to the refresh button, and when it’s registrered you get a small text banner saying you ‘hard’ refreshed the page.
Optionally, you could add two extra settings where you could change the duration of the keypress and the text of the banner shown when refreshed. [thanks @rory586]