From the admin panel:
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Minimum Time Between Posts
You may prevent your users from flooding your forum with posts by activating this feature.
By enabling floodcheck, you disallow users from making another post within a given time span of their last posting. In other words, if you set a floodcheck time span of 30 seconds, a user may not post again within 30 seconds of making his last post.
Administrators and moderators are exempt from floodcheck.
Recommended: 30 seconds. Type the number of seconds only. Enter 0 to disable this function.
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Floodcheck - Minimum Time Between Messages
Private Message Flood Checking. Select the minimum time that must pass before a user can send another private message. This is to prevent a single user 'spamming' by sending lots of messages very quickly.
Set this to 0 to disable the option.
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So I guess these can't be changed by usergroup. Unless there is a vb modification or something.