show available quests versus all quests

[scruffies]

New to Wow and L3 ATM. In Tinkertown I see various quest givers with the yellow exclamation point over there heads, but most of them do not offer quests (yet). I like seeing all the quest givers, but would like to change the color of the exclamation point for those that offer quests I can actually get right now versus all of the quest givers in the area. I am hoping it is a setting somewhere, but damn if I can find it....

Thanks for your help.