[eyal282]

While I don't have a usecase for it ( I used to, then scrapped it )

I figured out a method to slightly or immensely increase your speed, but not to a target value, nor to a target player.

You could try to decrease the players speed.

It works by setting the next expiration of healthshot ( gives speed boost ) to 0.04 every frame, to ensure you don't get a blue screen.

It might show a side effect of a blue screen, but I cannot see it.

#include <sourcemod>

#define PLUGIN_VERSION "1.0"
#pragma newdecls required

#pragma semicolon 1

public void OnGameFrame()
{
    for(int i=1;i <= MaxClients;i++)
    {
        if(!IsClientInGame(i))
            continue;

        else if(!IsPlayerAlive(i))
            continue;
        
        else if(IsFakeClient(i))
            continue;

        // Setting the expiration to higher will cause blue screen.
        SetEntPropFloat(i, Prop_Send, "m_flHealthShotBoostExpirationTime", GetGameTime() + 0.04);
    }
}

Using the cvar:

healthshot_healthboost_speed_multiplier 50

Will result in 357.29 units of speed according to cl_showpos 1 when running with a knife.