I tried tabling Ace Combat-style missile lock in FSO once, but I haven't found any good pixel settings for anything reasonably fast (since FSO goes by missile type with no bonus/penalty based on fighter class), anyone knows?
I've only played the PSP one so I don't know much... but the lock speed for normal missiles (not the fancy QAAM, XMAA, etc) looks to be kinda based on how "modern" the fighter is rather than the missile type ... but it's just the targeter dashing to the target, sometimes all the way offscreen-to-offscreen, and locking on immediately with little to no catch-up penalty...
FSO's targeter when I set some high number, it goes in fast, but if I miss the first lock, it will just go waay off and the re-lock takes forever... or something... I forgot what it did, but it definitely wasn't what I was after...