MC parameters

[JDR Dragoon]

Regarding 1, no. It merely means, that you can now specify a mine-laying probability that is something else than the default 50% of the digging in chance. It is thus a stand alone value.

2:

From NGP user manual, p. 39

Counterbattery Spotting
When the Optional Rule for Counterbattery Fire is enabled, there is the chance
that when an unspotted artillery unit fires, it will become spotted. By default,
the probability of this occurring is:
Counterbattery Spotting Probability = Normalized Strength / Range To Enemy
Where Range To Enemy is the range of the artillery unit to the nearest enemy
unit and Normalized Strength is given by the equation:
Normalized Strength = Men-Equivalent Strength / Max Road Stacking Value
This probability applies up to ranges of 10 hexes. The Parameter Data Value
for Counterbattery is used per side to modify this default probability.

My emphasis.