Running/Walking for rpgmaker 2000

[Infected]

Hey everyone! I've been wanting to add a running/walking system for my game. It's on rpgmaker 2000 and just wondering if it's even possible for the old version.
But if it is, please I'd like to have something.

Basically what I want is where after running for so long you get "fatigued" where it halves your movement speed(not-battle speed)
and then after so long of "resting" you gain your full stamina.

If that can't be done, I would really like a way where you start out walking but have to hold down a certain key to run.

Thanks in advance!