I agree with you. If LP played only studio versions of their songs, it would get stale quick. Faint and One Step Closer extended are really great, and add more energy to them.
Most of the show, people were just moving their arm in the air to the songs. Definitely more crowd participation during 30STM. I'm jumping to LP songs when everyone around is standing still. I'm sure LP must be disappointed with their crowd reactions. It's basically like the majority of the crowd was there just for Hybrid Theory and Meteora.