Some more details would be needed to understand what your ideas are exactly with those traits.
"poor driver": what would it technically do because there is "sunday driver" already.
"mute": would not be really an issue in multiplayer and in single player none at all.
"scared of guns": what do you mean by "having a hard time" using them? instant panic, low aim or you simply can't use them?
"driving instructor": what does "good at driving" mean in game terms?
"half dead": the points-system does not work well with traits that have positive and negative effects at the same time.
"delicious/disgusting": would be a multiplayer-only trait - at least for the time being.
"shut in": "hard time" from a health perspective or stress?
Hotfix 41.78.15 - December 5th:
Fixed being able to still add a split-screen player when AllowCoop is disabled.
Fixed seeing through walls sometimes after loading into a game.
Fixed an error in ISZoneDisplay:getZoneTooltipText.
Fixed players briefly appearing at 0,0 on the in-game map after joining a server.
Fixed displaying players with name ??? on the in-game map. This happened when the client had not received the first full update with the player's name and other info.