This would be invaluable to modders and programmers alike, who would be able to make modifications to ultimately improve the playabilty of the games much more easily than before.
Topic starter drwbns sums it up well.
The original topic on our forums can be found here, more importantly, head over to Petition Online to sign the petition, remember to use a valid email address too.
Creating enhancements such as improving gameplay physics, weapons, and netcode could be a start and would show the GTA community contributing back and showing their support for old favorites.
Thanks for the support everyone!