When docking, many folk like to use the directional keys to line up. One of which is the "a" key. Or type things like "thanks" to those whom they've just completed business transactions.

"a" is also the hot key to "sell all" in the first screen of the station pda when you dock.

If not removed, at least put a popup that asks if you're sure.

There is a setting in the options section that provides said popup or some such which prevents the accidental cargo sales.

It is nice to know I'm not the only one who has been inconvenienced by this.