Different Quest Icons/difficulty indicators

I'm building quest trees for my classes this year, and my goal is to have a required trail of quests that students have to follow, and then optional branching quests that students can pick based on interest. It's working for the most part, but it would be AWESOME if:

• I could make modifications to the quest pins to indicate whether they're required or optional, even if it was as simple as changing the color of the pins. 
• I could indicate the difficulty of the optional quests - 1-5 stars next to the pin or something. 

Either way, quests is looking great, and I'm excited to see what upcoming additions you make to it!