I'm wondering about archery and the few speed-based perks such as move faster when blocking, no-armor-weight, and move faster while firing a bow.
Your idea can be one of two categories:
A) Unproductive Skillfulness
B ) Extreme Progress
A) Feats of skill that don't level you very fast and won't help you complete anything faster. These only focus on doing something difficulty for the sake of it.
B ) Attempts to speed-run quests and level faster go here. Anything that you could make progress on from kills to money and beyond.