First off, the Skill itself, based on level, could be tied to how fast you move when walking or running. For instance, for every level you have in the skill you move .5% - 1% faster. This wouldn't make you a super speed demon as you wouldn't be running Mach 5 but could be useful universally amongst all archetypes.
Second, the actual Perks do not, and should not need to be limited to "Add X Jump Height," "Add +X% Movement Speed," but rather could add some very useful, and very simple, advantages.
Jump while running anyone?
A dodge roll?
How about enhanced movement speed while blocking?
Faster movement speed when over encumbered?
Stealth running?
Faster movement speed when Health is below a certain point?
Faster attack speed with all weapons?
Etc, etc.
Discuss.

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