Well, I haven't confirmed that wasn't changed for any 2.0.x version, I only checked the latest development version.
EDIT:
Same for 2.0.x. I don't really know what is going on; in firewall_nat_out_edit.php it should not be able to know the difference between "interface address" and "any" for the translation address, because in the current state of the code the HTML will always have those two fields set to the same value. I've even tested it and the configuration comes out the same.
If you select "any" for translation address and save the rule, is it still selected if you edit it? If so, either you must have a modified version or we aren't talking about the same page.