Plugin for Team Fortress 2
Requires Sourcemod 1.8+ and Metamod 1.10+

sm_stamina_enabled - Enables/Disables stamina sprinting.
sm_stamina_speed - Speed increase value when sprinting.
sm_stamina_class - Bit-Wise operation to determine which class can sprint.
sm_stamina_drain - How fast to drain stamina, 0.1 is fastest.
sm_stamina_regen - How fast to regenerate stamina, 0.1 is fastest.
sm_stamina_hudx - X coordinate of HUD display.
sm_stamina_hudy - Y coordinate of HUD display.
sm_stamina_team - 0 - None, 1 - Both, 2 - Red, 3 - Blue.

1. Place stamina.smx to addons/sourcemod/plugins/
2. Place stamina.cfg to cfg/sourcemod/ and edit your convars to fit your needs

Scout =		1
Sniper =	2
Soldier =	4
Demoman =	8
Medic =		16
Heavy =		32
Pyro =		64
Spy =		128
Engineer =	256

To use sm_stamina_class, add the values of whatever class you want stamina sprinting to work for 
For example if i wanted only pyro and medic to have stamina sprinting, i would add 64 + 16 = 80
I would then set sm_stamina_class 80 
511 will enable all class to use stamina sprinting

This plugin is enabled for all clients who joins the server
If you want to limit this to an admin flag then set your admin overrides to 
sm_stamina_override

Plugin must be reloaded if you change the override.