CSB Speed Boost raises a player's maxspeed for a configurable duration. Boosts trigger from zones defined per map in addons/amxmodx/data/csb_boostzones/<map>.txt (one x y z radius per line) or from the /boost chat command, which other plugins (shop, VIP) can call too. The boost is re-applied on every weapon switch via the CurWeapon event, and a HUD line counts down the remaining time.
fun module in modules.ini.plugins/, add to plugins.ini, change map.