I'm not sure (from your description) what your jumper is. However, "displacements" are probably not what you want to use. A "displacement", in simple terms, is a moved restraint. Once you specify a displacement (or a restraint), the node won't move any further, no matter what the loading.
I suspect you want to specify an "offset". There is a "checkbox" on the spreadsheet, just below the "delta dimensions". Put the focus here and press [F1] for help. See if this is what you want.
As to convincing someone to use CAESAR II, suggest they review this forum. Another good thing to do would be to ask around the industry, what program are most people using?
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Regards,
Richard Ay - Consultant