CB

For Community Builder there are second level menu items for:

User Management -> Add New User
Tab Management -> Add New Tab
Field Management -> Add New Field
List Management -> Add New List
Plugin Management -> Install New Plugin

It would be nice to extend the GroupJive and Paid Subscriptions menus for:

Paid Subscriptions
Gateways -> Add New Gateway
Plans -> Add New Plan
Promotions -> Add New Promotion

For Taxes maybe following (not sure how useful these are)
Taxes -> Add New Tax Rule
Taxes -> Add New Tax Rate
Taxes -> Add New Geographic Zone
Taxes -> Add New Country
Taxes -> Add New State / Province
Taxes -> Sales Tax Report

GroupJive
Control Panel (needs to be added)
Groups -> Add New Group
Users -> Add New User to Group