1. Its the swashbuckler in me, as well, that prefers that it be per encounter. It just got old, after a while, tumbling all the time. The theme of that use of the Tumble skill is that you pull off some acrobatic trick that lets you move so quickly that no one gets to take an attack of opportunity. Do it every round, and you start to approach farce.
For what its worth, remember that there are a LOT of other mobility options in 4e. Just look at all the rogue abilities that let you duck and weave around the battlefield.
For what its worth, remember that there are a LOT of other mobility options in 4e. Just look at all the rogue abilities that let you duck and weave around the battlefield.