Kickmeter, Bob,
There is nothing illegal about it. Remember "reasonable suspicion"? This is similar, but a combo of that and implied consent, but with not so stringent requirements. Basically the laws state that WDFW officers have the authority to temporarily stop/detain you. Just as in reasonable suspicion. They do need to have some articuable (sp?) facts, ie; your are fishing/hunting, you have equipment for such, or you may be on your way from such activity, etc. That is all they need for the stop. Plain and simple. There doesn't have to be the belief of an infraction.
The implied consent comes to the inpection of your equipment (includes cooler, truck, and boat), etc. If you refuse, then you just committed a Gross Misdemeanor, and then because of the commission of a crime, the immediate area and equipment becomes SUBJECT TO A SEARCH FOR FURTHER EVIDENCE OF SUCH AN INFRACTION. You are now not free to leave. A five minute conversation becomes an hour break with your hands clasped behind your back while seated on the back of the game agents truck while he or she searches EVERY inch of your truck, your boat, etc.
The issue about the wording on your license is only the tip of the iceberg. Remember the 5"x9" book?
I double dog dare (

) anyone to head on down to their local WDFW hotspot where checks are a given and refuse, verbally. Let us know what happens.
Have a good day.
Andy