We usually have more than one person working on deals collaboratively, to associate the users with the deal we have added several User fields in the Layout for the deals module.

When creating workflows you don't have the ability to assign tasks to the users named in the user fields which would be really useful. I have been in touch with Zoho and they have very kindly provided me with a deluge script to enable me to do this but it would be great to have this as a native feature.