I'm with baldy. If a cop is having a bad day (or needs to pad his quota for the month), he will stop you, give you a ticket and explain to you how parking lights are for parking, and not driving.
The DRLs on every car that I have ever lain my hands on have involved either the low or high beam lamps. Sometimes the parking lights are involved, and sometimes they aren't.
I might also note, that in every car that I have ever owned that sported DRLs, I've disabled them. They've not been proven to be any safer, and the data that does exist points to them being more harmful than good -- which is why in most states (49, last I checked) you don't get an insurance discount like you do for airbags and seatbelts.
If I was you, I'd just turn on your headlights. You can't go wrong with your regular low beams -- and it's less work. If you are in a state that requires you to turn on your lights when it rains, or when you're in a construction zone, or whatever, you won't get a big fat ticket for not having them on.
If you must do something to your parking lights, wire them so that they come on as parking lights AND as marker lights when the headlamps are on. That is pretty easy to do; just put the parking light wire on the tail lamp terminal on the switch. The switch should be beefy enough to handle whatever extra current a couple of 3 candlepower bulbs will draw.
