I'm with you Sarnia
I have a shallow left turn which is the third turn out of my village where the indicator doesn't always return off
Gets me nearly every time especially in the bright weather with my music on as I'm treating my village to some top jazz ( I must be annoying as hell,....if hell fire damnation can be described as 'annoying' )
So I find myself indicating left for the next half a mile or so until my next turn
A buzzer, louder click or a warning light higher up would be a good prompt