Not sure that your question really makes much sense - we don't have such things as "multi-dimensional-objects"?
Struggling to envisage your "use-case", but if your question is related to being able to update data in/from a multi-dimensional NSQL portlet; then that also may be problematic - we can provide links off to object-instances from a multi--dimensional portlet, but only for the "rows" in the portlet ; we can not link from the "cell" value (the intersection of the row and column).
TL;DR "No"
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EDIT : thinking about this a little more, I guess that you could argue that any object-portlet with time-scaled-value is, in fact, multi-dimensioned (the second dimension being time) - we can build portlets on those I guess, but are limited to the stock object data-providers that provide TSV "attributes". (and there really should be a stock portlet which allows access to that object anyway)