Currently Being ModeratedJan 2, 2013 7:07 PM (in response to 4r1)
Nothing has changed in that regard. The best workaround in my opinion is to add an auxiliary column to be the indicator of the condition you wish to highlight. In the auxiliary column you can calculate a result that you can then apply normal, non external cell referenced, conditions to.
Here's an example where the condition of a column to column comparison is flagged by a red cell, just not one of the data cells.