I have only tested this mod on default AI physics and I have no idea how it works/behaves with physics mods but it should work.
Changed/fixed AI lines at various places. As editing each track takes a lot of time and effort I decided to update this mod 5 tracks at a time plus updated tracks from the ones I already uploaded(if i fix something or make it better). This is still work in progress so any feedback in the form of TRACK/TURN make it wider or tighter or I don't like this turn or something else will be greatly appreciated as well as how it works with the physics mod that you tested it with.
Installation: Extract the zip file. Use MixFileRemixer to extract the DATA.MIX file (make a backup in case you want to revert to default), then in the TRACKS folder find the track you want to edit and just copy and overwrite the correct SPLINELAYER bml file. For some tracks there are edited OPTIMIZATION.bml files which are optional. I was briefly testing the changes they make and they should make the AI more aggressive on the throttle and brakes but they may go a little wider then intended. There are also changelog.txt files for each track. When you are done just create the new DATA.MIX file and copy it back into your motogp15 installation directory.
As requested I've made a tutorial on how to edit AI lines. You can download it here - https://www.dropbox.com/s/wjcp6mrnslf468x/AIGuidence editing mod.docx?dl=0
Finally a big THANK YOU to Dyego JhOu for adding some functions to the BML editor and making my life easier.
Here are some images: