The Ready State Virtual Mobility Coach is like having a virtual Kelly Starrett in your pocket.
Yes improving internal rotation will help.
You want full range in your joints.
If you see improvement with foam rolling then do it.
A few internal rotation episodes to check out.
Episode 249: Improving Hip Extension (And Internal Rotation) for Running
Episode 151: The Runner/Split Jerk Dream Mob
Episode 142: Tight IT Band and Hip Flexor Fix: Runners?