No Burrman, that is not what I mean.

An option in the preferences to choose wether selecting an object deselects all other objects if no extra keys are pressed, or leave the behaviour as it is today.

the esc key deselects everything, just like clicking next to objects deselect it, but that is an action again. and remembering every time to click somewhere or press the esc key is tiresome for people with "Alzheimer Light" like myself ;-) since the behaviour in 99% of the other software is different.