Thank you very much for all those answers! I must say I am amazed so many of you took the time to help me.
Reading all your answers and other post on the forum in the meantime I think my plan will be :

1. If it is an easy day... do 5 minutes actions as I would do 2 minutes actions. This somehow sticks to the principle of emergency and priority comes to you naturally don't make it complicated. If I have the time to do immediatly a 5 minutes action I will know this instinctively, do it and the problem is solved.
If I feel it is not the day I move to the next point.

2. Put the action support material in a "Today Action Support" folder.
3. Before I leave the office in the evening the today action support folder has to be empty. If not I move the support material in the general "Action support" folder if the action is not project related or in the project folder if it is project related. The action enters the usual system and is written on a list with context etc... This should not happen too often if the action was a TRUE must do today action.