I noticed that certain stuff do not reward you score, so I am here to suggest them. Also these could be presented with certain medals certain UI in the game but that's potential.
Long shot will reward the player for each gunshot kill from 50m+. The score reward will be X-50, with X the meters of the shot.
Multiple (double/triple/quadra/penta) kill:
Additional points for killing someone after less than 5 seconds after you killed someone. This can be stacked up to 5 times. +10/+20/+30/+40/+50 score. I know this may overlap with the current score system but yeah.
You can suggest other score awards in-game here.