I never pick up open time with guys on furlough. But for me that's more about solidarity with the pilot group than a belief that the company will be forced to recall pilots.
I've noticed that, even after all furloughs are back, there are more than a few guys who still have a residual, irrational opposition to overtime. They somehow think that picking up trips help the company to the detriment of the pilots. Its just too ingrained in their heads.