In my opinion the ability to flash your headlights is to show your presence, not to say, "You can go first" which it is often used for. That can be misinterpreted as "I am going first".
If your dipped headlights are on then unless the other driver/s is/are half blind, they know you are there and don't need a flash.
It is similar to waving somebody out or to cross the road in front of you, totally dangerous.
In a position where it is not obvious who goes first then somebody needs to make the first move with care rather than the assumption they now have right of way or have been given the right of way.
Common example: You want to turn left (or right), into a narrow road where a car is waiting to join your road. You flash, he starts to come out but neither saw the overtaking cyclist or car! BANG.
Would you stop? You caused the collision.
Sorry, seen to many avoidable collisions and futures damaged for life.
As for gloves, you should never drive whilst wearing thick gloves. You do not have the same 'feel' as with bare hands or with special thin driving gloves. Then no problem with the button size.
Edited by: makem