Any addon for advanced screenshots?

[hasnogaems]

That will let me change default folder or give screenshot name on the fly?

[Seerah]

Nope. Addons only have access to the game.
https://www.wowinterface.com/forums/...ad.php?t=42367

[SDPhantom]

Addons can't access the computer's filesystem, but given the naming format for WoW screenshots, they can say where to look.

Example:

print(date("WoWScrnShot_%m%d%y_%H%M%S.jpg"));

References:
os.date()
strftime() Format