clicking with the mouse button will enable/fire most items that are in the highlighted quickbar slot.
At least the following actions are executed despite open chat:
- Firing missiles
- Activating any effect computer
- Open advanced build mode (der_scheme has bound this to 'F')
- Open/close chat (SpaceKing bound his chat key to a letter)
- Record GIF (is this a good or bad thing?)
- Activating cloaker/radar jammer