Features / Usability

Hello All;
This is a very specific use case and I haven't found an answer in the forums soooooo...Can I use the cate-group method to allow a "leader" group member to add other members but have the added members have limited perms e.g. not the tiki_p_group_add_member, tiki_p_group_view_member, tiki_p_group_remove_member perms? If so please explain how. So far I have been unsuccessful and it was my impression that this is possible. What I have done:

1. Created the category
2. Created the groups: one as "Leader" ; one as "Member
3. Assigned the perms under the group heading in the permission interface for the category
4. Placed a wiki page within the category and on that wiki page used the wikiplugin member_list
5. So far so good, the problem is that only the global perms apply to the member_list plugin, not the group perms for the category.

This works for wiki page perms i.e. edit, view and for blogs and forums. In other words for objects, how do I get it to work for the plugins....can I?
Thanks for your input