Martin Burns gets stocked at least 3 or 4 times a week, all season long. There are birds there pretty much all season. Do you hunt with a dog(s)?
Releasing birds early will result in very few to no birds to hunt. Pen raised birds do not do well on their own. There is a huge predation issue with coyotes, foxes, owls, etc. Then add to that all the hunters the first week or so of the season, and by the 3rd week or so there would be no birds to hunt.
One thing I have to give Mass DFW credit for is their pheasant stocking program. Although there is room for improvement, they do a far better job at this than any other nearby state that I have hunted.
Now as for actually MANAGING the WMA's, that is another story. It wasn't all that long ago that they actually did something about habitat in the WMA's. They kept fields cut and even planted corn and left it standing for the wildlife. Not anymore. Those fields that used to be cut and managed are rapidly reverting to forest. There are virtually no field habitat left in the WMA's (although they did finally do some limited cutting in Marting Burns a couple summers ago.)