No they can't do that already. They can not post a mission asking for escorts. There is no payment system in place. You could not only use that for player interaction but for pve as well. You could for example escort a NPC trader fighting off NPC pirates. That would greatly enhance the current missions and lead to a better gameplay. Why people are against gameplay improvements is beyond me.
So you couldn't send me a message in game and say "hey, escort me through system x and I'll abandon 2t gold for you"? Seems fairly straightforward to me.
Who is objecting to improvements? I see people speculating about the potential impact of upcoming introductions but that's all.