I think I have seen instructions somewher on how to specify the looks of the tag cloud in WPMU for Joomla, just can't seem to find it again. Tried to google it and found several sites and blog posts describing how to do it. Some suggesting changing wp_tag_cloud() in widgets.php others suggesting to write a plugin. However, none of these seem to work for me.
I thought this should be trivial (like setting parameters for any Joomla module) but...
Glad for any help!