I think that, considering how many people have brought this up in various places, fast pass and single rider will be added in time. Basically, all we need is to have the option to do three things:
1) Make separate queues that merge together at a station or boarding point (if you have several sims for a flat ride like star tours for example, hence why I say 'boarding point')
2) Label what ride your queue connects to and what kind of queue it is (so you decide if it is either standby, single rider, or quick queue)
3) Not exactly needed for fast pass per-se, but still necessary for proper queues in general: the ability to merge and fork queues. I mentioned Star tours: the standby line and fastpass lines merge in the boarding hall and then guests go to one of six simulators. SIX simulators... If you want to increase your flat ride capacity in PC, you have to make a new queue for each one and that's not realistic...
And keep in mind: all of this extra queue stuff would be optional - an additional feature you have to go out of your way to use like mix master in RCT3. So the casual player can just build a standby queue and be done with it in 2 min if they want to.