I found this code in another post.
It requires the fun module, I do not know if it helps you, and I do not even know if it works kk.
PHP Code:
set_player_maxspeed(id)
{
// If frozen, prevent from moving
if (g_frozen[id])
{
set_user_maxspeed(id, 0.0)
}
// Otherwise, set maxspeed directly
else
{
if (g_zombie[id])
{
if (g_nemesis[id]) {
set_user_maxspeed(id, get_pcvar_float(cvar_nemspd))
}
else {
set_user_maxspeed(id, g_zombie_spd[id])
}
if (g_predator[id]) {
set_user_maxspeed(id, get_pcvar_float(cvar_predspd))
}
else {
set_user_maxspeed(id, g_zombie_spd[id])
}
}
else
{
if (g_survivor[id])
set_user_maxspeed(id, get_pcvar_float(cvar_survspd))
else if (get_pcvar_float(cvar_humanspd) > 0.0)
set_user_maxspeed(id, get_pcvar_float(cvar_humanspd))
}
}
}