The maintenanceformtoolstrip is designed to connect to the first BO in the collection of BOs associated with the form. You can have as many as you want on a form, but they will all talk to the same BO

(actually, god only knows what would happen if you had multiple on the same form).
With a bit of work you could just roll your own. The browse dialog functionality is the only part I'm not familiar with. Just make a toolstrip with edit, add, save, undo and remove buttons as well as the move first, previous, next and move last. Add a BusinessObject public property of type BusinessLayer. I'd add the ResetBusinessObject and ShouldSerializeBusinessObject properties to, to support the designer. Wire up the buttons using the BO methods. Finally, react to the EditStateChanged and Navigated events to enable/disable the buttons as needed.
Then you can have as many as you like on a form.
However, before you do that, if the BOs are related (a parent and many children), I'd try just settings in the "StrataFrame: Form Include Settings". By setting the IncludeInFormAdd, IncludeInFormEdit, etc. properties to True, the maintenanceformtoolstrip will work with any BO with these properties to true. The first BO in the collection (the main BO), will have all of these set to true. Others by default with have only IncludeInFormSave set to true. If you setup the parent relationship for the BOs, then set the parent BO on the instances, set the appropriate properties to have child records filtered and have set the IncludeInForm[n] properties, then all editing/navigation will be in synch and parent/child relationship managed.
I have done the first (manage each BO separately), but I'm going to be investigating the other method. It seems easier, the user experience is nicer (they don't care about parent/child stuff...they just want to edit/add stuff), but I don't know the limitations/gotchas yet.
Good luck.