Mk-82 AIRs are indeed less precise than normal Mk-82, due to the retarding method they use. They're meant to be fired while very low and in a ripple setting. Don't try to plink single targets in a dive or from more than a thousand feet with them, that's not what they're for.
You mean the laser. Yes you do need it to keep the target painted. Setting the DSMS to autolase 10 seconds before impact works most of the time for most attack profiles.
For more information about how the sim handles TGP, ranging, lasing, and their limitations, see this thread.
The keyhole limitation was added a few months ago. See this post.
MFCDs are not supposed to be looked at through the NVG. I suggest using this mod to get rid of the pretty terrible stock NVGs, making it easier to look "below" them.
Not that I know of. Ironically, it's one cockpit element that when illuminated is only readable through NVGs.
Normal behaviour.
NET OSB in the TAD. See the manual for details.
AI is aware of your SPI at all times, regardless of your settings. For MP, set SPI BROADCAST on the TAD (or DMS LEFT LONG).
No need to add a SEAD weapon to a platform not made for SEAD.
Yes, see this thread.