Yeah, when it comes to adding weird ingredients, the search function is the way to go. Unfortunately, you'll find all sorts of recommendations on HBT... but you can take this info, average it all out, and usually end up with something normal.
This is the method I used to decide on how much spice to add to my pumpkin - lots of research and averaging. You'll learn how to look at someone's post and determine if you can trust their palate and descriptions. There's a lot of "I used an entire tablespoon of X and couldn't taste a thing" and "I used a teaspoon of X and it had a subtle flavor on the back of the tongue that really complemented the hops and crystal malts, but it wasn't really present in the aroma." Which of those would you trust? Go with the people who have the best, most thorough, and most open-minded descriptions.