Speedbrake (the legendary HK custom mission maker?), I've never seen an OIF Key Command PDF. I reckon that's because the key commands are printed in the cover of the CD jewel case.
If you'd like, I can type them out for you, no problem.
As far as add-ons, Pretzel's stuff is still what you want...
(Well, crap! I went to provide a link to his site but I believe the Pretzel Works site is now gone. Now I'm sad.
Give me a moment and I'll create and host a self-extracting executable with Pretzel's HK add-on files (works for PSF and OIF). It's a simple overwriting of existing files.
Here's some screens of Pretzel's enhanced clouds in PSF... http://www.simhq.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=3;t=002219
Looks good in OIF as well.
You'll also want the one and only OIF patch... http://graphsim.com/support.html
(click F/A-18 OIF, it'll be a download at the top).
Xicat had nothing to do with OIF (only PSF) so you won't find anything there related to OIF.
I never warmed up to OIF (still consider PSF to be my all-time favorite flight sim), especially OIF's so-called "fully 3D cockpit". I like PSF's 2D/3D pit MUCH better (old-school but it works really well, IMO).
Now that I have my first HOTAS
X52), maybe I'll give OIF another shot. Maybe with the X52's programming abilities, I can work around some of OIF's cockpit limitations (i.e. cockpit zoom factor not saved).
I'm really into TAW lately but I've been yearning to get back to a little Carrier Ops and mission playback watching. I think I'm going to put PSF and possibly OIF back on my HD alongside TAW.
Anyway, I'll get those files ready for you in just a moment...