I've heard all the lore and all the explanations and negativity surrounding why dryads shouldn't be able to fly.. but let's face it.. they can't even hover over water.
I recommend that they were allowed to have a timed ability (after a lengthy quest) to "jump" for short distances using their wings with an augmentation of magic. Distance being a relative measure considering their small stature. But enough to gain access to places they haven't been able to in the past and get over streams at least. Maybe rest in a tree while they recoup. See the top of a building for a change?
I'm not talking about sustained flight (although that would be nice to see for a biped race) but something a little easier to get in the near future.
The following considerations would need to be addressed of course:
Height (for lore purposes, no higher than the highest tree due to safety considerations)
Duration of the ability effect (should be directly proportionate to the cooldown I.E. if the duration is longer, the cooldown should be too)
Cooldown
So there you have it.
And, since this is such a touchy subject, please try to stay on topic and provide "constructive" criticism. If all else fails and you just hate this idea and don't want to see it in the game, give a reason why and maybe another alternative.
The best suggestions come from someone complaining about something and following it up with a solution. Nothing was ever resolved from just complaining.