OF defensive park adjustments
I don't have them, yet. But I did put together outfield positions totals by ballpark for 1987 to 2006.
OF totals by park and position
Only one park has more than +10 runs per year, and just barely at that. There are a lot more parks with positive values, which is what I expected. No park really makes it easier to catch flyballs, at least by much, but some parks make it very difficult. So while a few parks will have large negative vlaues for ZR, like Fenway, Enron, Camden Yards RF, most parks/positions will show a slight positive value, since this is a zero sum game.
Some of the parks with large negative values are no longer in use, such as Mile High and Exhibition (Blue Jays for you newcomers). Pretty much the current in use parks with negative values are Fenway, Enron, and Joe Robbie LF, and Camden and Metrodome RF, as expected. Others I did not expect are PNC right and left, and all the Coors positions. Great American ballpark CF is almost certainly due to Griffey being the primary player there, not a park effect. PNC might just be due to bad Pirate OF's, but its worth checking out. I though STATS redefined the zones used for Coors, so I'll have to check and see if the low ZR values are coming from early years or if there is still a problem with their data.
Parks may not be listed under their "official" name, as I don't respect corporate naming rights unless I get a share of the money. Sometimes I use the corporate name, its just whatever I like best in any case, for example I prefer "cellular" to "Comiskey II" simply because its easier to distinguish from the original Comiskey.