While not necessary for the game itself, a possible mission screen would try to allow third-party content creators (modders) to create their own sort of "mission packs", or "campaigns", which doesn't force the game to attempt combining user-created missions and premade ones.
>Mission Class: College Poorfag
>Mission: Aventura Alaska
>Goal: Travel to some tiny-ass town in Alaska that your wierd uncle goes to during vacation. In order to spice up this year, you decide to drag 2 of your lackeys along for the ride
>Optional Goal: Drop off package in Juneau for some loser online
>Optional Goal 2: travel via the Alaska Highway