(these are not official answers. However, I'm pretty sure I'm right
)
1. Coordinated Fire
There's nothing to indicate that there would only be 1 BM. Each of the Coordinated Fire formations takes a separate action. The shooting part of that action may or may not (e.g. out of range) place a BM on the target formation.
2. Tau Jump Packs
2.1 Entering ZoC
The only time you can enter an enemy ZoC is when you're performing a charge move (see rules, 1.7.3 and 1.12.3) or countercharging (see 1.12.4).
The
Tau Jet Packs rule does not specifically allow entering ZoCs. Therefore, it is not allowed. However, the Tau Jet Packs rule can be read so that a jet pack -equipped formation decides not to fall back and could then countercharge with the normal rules.
2.2 Falling back out of range
Fallback with jet packs occurs before the charge move. Determining if the assault gets in range of the enemy takes place after the charge move (see 1.12.3). Therefore, if the Tau formation falls back out of range, the assault stops after the charge with no resolution.
2.3 Some intermingled formations falling back
(presumably, you meant "formations" instead of "units" with the question)
According to 1.12.10, it is enough for the target formations to be intermingled to be involved in the assault. This means that if everyone does not get out of range, all target formations are included in the assault.
We have a house rule that states that the attacker needs to get within range and los of all target formations to have them included in the assault. In this case, a single formation could jump out of range and escape the assault. It may be that the Experimental Assault Rules have something to this effect.
3. Crisis walkers
I asked this same question from JimmyGrill a while back. The answer was: "no, Crisis suits don't have walker by design".
4. 5+ GMs
I feel the same way. The missiles are ok at 6+.
