Concerning Feats, My assumption is that Feats can be used in a campaign. I ask because feats appeared in an expansion after the Road to Legend. If they can be used are heroes limited in how many they get at the beggining of the game and also during the game. And does each hero get to draw one feat card everytime a glyph is activated.

From the FAQ

Q: How do Feat cards from TOI interact with the
advanced campaign?

A: Start with the normal mix, and draw 1 per hero per
glyph activated. Feats stay around between dungeons/
encounters. They are present for the Lt. encounters, but are
discarded at the start of the final battle with the Avatar.

also

Feats
Heroes may only acquire Feats that match their skill set. A
hero may not gain any feats, regardless of skills purchased,
that fall outside their printed skill set.

There are also a few FAQ regarding specific feats. I recommend reading the FAQ all the way through (a couple times) for every expansion your group uses.