>>If you want to make the form independent and use it elsewhere, you should probably consider a private datasession for it, to ensure it doesn't change anything on the other form. On the other hand, if this is its only use, sharing the datasession and manipulating the same bizobj, you shouldn't have to pass the value back, just set it how you want it from the modal form.
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>Is manipulating a second view in the bizobj (if that's what you call changing the record pointer) considered to be manipulating the bizobj?

In that context, no. You can use secondary lookup views without changing anything in the primary view/DAO. Godfrey's post did a great job of explaining things.