I honestly don't use it as much as Leon does. I have other tasks to handle for the most part. You are right that it does have its errors but for the most part it has now cut apart about a million objects and only given issues in a couple of things. Sometimes geo disappears and sometimes it crashes if you press the undo hotkey.

Everything is simply working off of the Maya API. So to say it hasn't been kept after is pointless since the 32 to 64 bit switch. Once that went through it is simply executing tasks that are built into Maya natively. All subsequent releases are using the same architecture. The actual script for Roadkill if you ignore the export and import procedures is only 150 lines long. 50 of that being the GUI. It uses basic calls and generally speaking I am not exactly sure how you can make them better. The only possible way would be to store the UV's instead of flushing it. But then that creates the issue of possibly having multiple UV sets which will cause confusion or not export at all depending on if you are using game engines. You could change the code to reflect a ! command and execute an else statement that just flushes the UV's on undo.

I keep rambling. Time to get back to work.