[TigerC10]

Glad to see my help got this modification added so quickly! You've got a problem with your XML file. It should look like this toward the bottom:

	<options>
		<settinggroup name="register" displayorder="200">
			<setting varname="fpx_rndm_usrgrp_list" displayorder="150">
				<datatype>free</datatype>
				<defaultvalue>2</defaultvalue>
				<validationcode><![CDATA[return( preg_match("/^[\d+[\s,]*]+$|^$/", $data) );]]></validationcode>
			</setting>
		</settinggroup>
	</options>

Without the setting/settinggroup in there at all, it would result in the problem Tobes talked about - being unable to alter the settings. This code change adds an option for the random group thing to the registration options and ensures that the list entered is a valid list of numbers separated by commas or spaces (or if they want to disable it they can just enter a blank, this will stop the extra code from running in the plugins which saves on server load - though they can also enter a singular 2).