GGTharos

No, it wouldn't be.  This is an old topic and there's a lot of misunderstanding and misinterpretation involved with these seekers.

All BFM is done in relation to the bandit, so that's your answer.   You need to read up on some BFM exercises; the speeds etc. that you need to use are guidelines to help you form a game plan before the merge and for every move your bandit makes thereafter.   You're going to be looking at the bandit, so 'hitting your numbers' is more of a cross-check to make sure you're in the right speed range that you need to be, the rest is all about how and when to point the nose at the bandit.  Analyze tacview and see why you're losing 2c (are you really losing it, or are you just sitting there hoping that sustaining at 400 will win you the fight?  'cause that's silly)

Unsourced text, claims that 'pilots said' and feelings are worthless.
Even so, the text above has a maximum detection range of 105km (~57nm), and that's for a very specific radar mode and hardware which IIRC the 68V5 (the one modeled in DCS - it's good to know these details before you start such discussions) does not possess.  I don't even recall where this graph comes from, but it is the basic reason why they write 'V9 offers 30% range increase' (over the V5, but they don't write that).

  USAF Vipers in 2007 (the ones DCS modeled in-game) use the V5.
 
The other non-factual statement you made (while claiming it as fact) is that ED did something to the F-16 radar because F-18 fans complained.  This is incorrect.   The F-16 radar was changed because it was over-modeled, presenting capability similar to an AN/APG-63 or AWG-9, which neither the F-16 or F-18 should some close to matching.
 
PS:  For even more fun, APG-66 with flight test results from some random internet source.

It's relevant to all missiles using proportional navigation; typically that's what a homing  missile will use.   Radar or IR doesn't matter here.   In this case, radar can add information (closure, target vector) to make the homing even more capable, but in both cases the missile will go into a collision course.
Even beam-riders and SACLOS missiles can go for collision - you need the right instrumentation to compute intercept and point the missile in the right direction, but there's no need to assume that anything will be doing pure pursuit until you see that it does.

Yes there is.  Get up to 400 and keep 400 in the climb.   Reduce pitch as required.   I don't recall if 400 is the right speed, but try to keep M1.5 if you can get it up there.

Do your warm-up before you enter the expected combat zone.    Do a full 360 or if you prefer, 90 one direction then 90 in the other; you can do this at 4g or if you prefer, at 5g 5g.  No need to go nuts.
If you're at high altitude, don't bother - you'll get your opportunity to warm up as the fight descends, and you're not going to pull a whole lot of g for any significant amount of time up there.
 
To answer your question about how it works:  Unfortunately I don't have solid numbers for you except that you must perform the warm-up at a minimum of 4g.  The best I remember is this:
4g for ~20 sec.
Lasts for about 10min if you do nothing.