Organisational search option
Like Jon said auto filtering the search using url param is in progress. But a work around for this until its available is to 


Create a smart group using advance search for each contact type. 
Grab search id (civicrm_group.saved_search_id) of the smart group either from database or api.
Replace the id in the url for ssID civicrm/contact/search/advanced?reset=1&amp;ssID=1&amp;force=1 and add it in your menu item.


Thanks

Pradeep