[kh99]

It's likely that one of the older mods would work since it's pretty simple. But you could do this: create a plugin using hook global_bootstrap_complete and this code:

global $vbulletin;

if (is_member_of($vbulletin->userinfo, X, Y, Z))
{
    $vbulletin->options['floodchecktime'] = 5;
}

(of course you want to change X, Y, Z to one or more usergroup ids).

Edit: Now that I look at the Similar Threads below I see this one for vb4: https://vborg.vbsupport.ru/showthread.php?t=243883