Reading the presentation, it looks like one single OVGME install is enough to be able to install its files in different game installs ( or even games themselves ). Do I understand this the right way ? ... as it should be the second most important reason for a definitive change.
Use symbolic links to point multiple programs/games to common folders. For example a dozen GTR2 installs could share one locations folder....
Mods are taking so much place with 2 or 3 installs ( with many similar files, locations mostly ) on drive !
...
I already did it with JSGME since the very beginning, a trick I learnt from an old friend.I also recommend you use prefix for all mod naming.
This way you can put all content in the order you wish.