@ Hi Neil, I have news for you.
I have sent the upgraded grass splines to DLS today at 9.00 am GMT.
They basically look like the old assets but made by a new method so they work in TS2009 or higher Trainz version only. (Tested in TS10 and TS12 native mode.)
The only problem is that they have new kuids and they will NOT obsolete the old splines. I'm a little bit troubled with the old spline versions, not mentioned that some of them are built-in in TS10 and 12. From the other side, the DLS drop back the uploaded assets if they have obsolete-table regarding non-existing DLS-content. So I made an other cdp-package of the new grasses which WILL obsolete the old ones. This is totally same as the DLS version, except the config files. This version is available from here:
http://speedy.sh/RA6Hj/FMA2-igrass-meshlib-obs-version.cdp
This will help you to upgrade your map and your multiplayer partners can download the new grasses from the DLS. I hope they will listed tomorrow or after.
Best regards
vendel