Thanks for testing it! The 600-second rule only lengthens buffs that already last 200 seconds or more in the original game. Nimble Feet lasts 4/8/12 seconds at levels 1-3, so it stays short on purpose. About refunding the SP you put in: that's Mark's call, and he'll reply here.

Update: Nimble Feet now follows the 600 second rule and is live. By level it lasts 200, 400 or 600 seconds (it was 4, 8 or 12). The speed boost (+10/+15/+20) and the 60 second cooldown are unchanged, and the skill tooltip shows the new times. No SP reset is needed, so your points stay where they are. Relog to pick up the new client and give it a try.

Doesn't work for me after retest post restart. Perhaps the update might need some time?