If I have two business objects on the same form and neither of them is the primary business object, and I have two MaintenanceFormToolStrips on the same form... can I bind one toolstrip to one BO and the other toolstrip to the other BO?

Since we cannot have multiple MaintenanceFormToolstrips on a single form. Can we add browse dialogs without the toolstrips?

Yes, you can drop as many BrowseDialogs on a form as you want... you can only set one of them to be the dialog called by the Browse button on the maintenance form toolstrip.  However, you can manually show a BrowseDialog by calling ShowDialog() on it, so you can just add a button or a toolstrip button somewhere and manually call the other BrowseDialogs.