When I add the above mentioned button to my toolbar it is flickering when I receive new emails for example. I assume this is because the button is greyed out, when no sending/receiving process takes place and reactivated again and again when sending/receiving takes place. As the flickering is very annoying, I would like to request changing this behaviour, for example by either: 1. enabling the button all the time, because when no sending/receiving is going on, the button should simply do nothing, or the user should be smart enough not to click it. 2. wait for a time until the button is disabled again, so that it is only enabled once and then disabled again.
This "flickering" is simply the button becoming active while an operation (sending or receving) is taking place and then becoming inactive when the operation is over. I don't think that is going to change.
Then it is unusable for me. I think my potential solutions could at least be considered.
How often do you need the button, anyway? It is not on the toolbar by default. Perhaps you could remove it and add hotkeys to the equivalent menu items?