I was recently over at GhostRecon.net (Hi Rocky!) and was surprised and excited to see that content (Custom missions/campaigns) are still being churned out for OGR!! Lots of stuff out there to try, but it would be difficult to keep up!
I would agree that the server should have at minimum GR+DS+IT. Maybe a 'mod of the week' advertised in advance to allow downloads? I'd favor more Mission/Campaign mods rather than total conversions, and, selfishly, maybe standardize on the great SPV4 Weapons mod for variety
I don't recall if GR had any SERVER SIDE mission/Campaign mods which wouldn't require downloads. My recollection is NOT, but then I never messed with any DEDICATED SERVER setup.