Lets put it short this time:
HUD targetting box is NOT on targetted enemy, if the target is close to the edge of the screen and command line: -fov 0.39 is used (box is further from the edge of the screen than the target). And if no fov line is used then the box is again misaligned (box is closer to the edge of the screen than the target). These problems became more obvious closer the target is to the edge of the screen. BTW It looks pretty much like the same thing that plagues the fred-open.
I get quite good result with -fov 0.6.
And another:
Weapons (non-beam) flagged as Huge target bombs.
Tested with 16/10 build