Actually, not true.
The shorter circuit is used for the local V8 race while the longer circuit is/has been used for the international races (eg F1 and the single 6 hour race held on new years eve a number of years ago)
The fast kink on the longer circuit (linking Jones and Brabham straights) had a bunch of raised kerbs that don't show up on that track map that tightened up the corner and forced cars to slow (at least a bit!) .. in fact, those kerbs are still there!
The newer, shorter version has a flat out kink which seems to be much more dangerous due in part to the lack of run off. So it's certainly not "duller" in that particular area!
IMO the longer track which included the off camber S bend near Gate 5 and the stag corner at Gate 6 was a much more interesting circuit

CLP
Realistically though, we shouldn't expect to see any developer kits until after S3, if ever...
and there's only 2 mods anyway ('65 and '69) ... in fact it's so damn difficult to create tracks or update graphics that only the most dedicated editors even bother - consequently each new track is like a work of art, and historically accurate to the point of being seriously anal (it needs to be or the Realism Police cart 'em off to Gitmo)...as for mods, well it's even more difficult to mess with GPL physics, so it's not like anyone can just open it up and make a new mod. The makers never even considered it when making GPL so, as with the other GPL editing tools, the guys who wanted to make the 1965 Mod (the first GPL mod - came out in 2004) had to basically crack GPL's exe and then spent years figuring out what did what and how to adjust it and testing everything ad nauseam ... messing with GPL's code makes mapping the human genome look like doing a google search 

illepall