D&D 3.5 Macro Questions

Is there a way to reuse a single result multiple times? Basically I have a character that uses craft skill checks, one craft check determines save DC, search DC, and disable DC. Two of these are the same, so I can recycle that, but one of them is 1/2 the craft check. So I need to display the initial check result, but I also need to display it in 2 other places, one of which needs to be cut in half.

You can't retain rolls without the API. The only way to do this would be to craft a macro that displays the raw roll and just includes plain text to describe what bonus' apply to what. ie: Craft check:  [[d20]] Save DC:  +2 Search DC:  +4 Disable DC: +4