To question one, the way the rules for attacking an elevated position are written, it does seem like there isn't a way to reverse them to charge someone at the bottom of a ladder or vertical elevation. I'm not sure that this work be able to trap a model at the top of something because the rules let a model drop from any height without needing to climb at the cost of no movement. You could just move your model over to where the enemy model isn't and drop down (might cause fall damage though). I've always understood it as being possible to drop into combat with an enemy that was below an elevated model, so you could probably climb part way down the latter and then drop of the side into combat with someone standing at the bottom of it.
As for falling into a control zone but not charging, strictly speaking that shouldn't be done because there isn't an exception to the "never enter an enemy control zone" rule. That said, the event needs to be handled somehow. I think you can either play at is being the same rule as the backing away into a control zone if it's force by an involuntary fall. Or you could follow the mumak displacement rule when either the falling model or the one being landed on, is displayed by the models controlling player just enough to give the fallen models base room to sit.
To question two, I recalling doing something quite like that once some years ago. To the best of my knowledge, your opponent is technically correct, but no one plays the rule that way because its generally considered an unsportsmanlike exploit even among competitive players.
To question three, I have always assumed that 25mm was intended to be the same as 1 inch for all intense and purposes. Fussing over a 0.4mm in converting measurements for a game like this seems like it would be mostly impractical to do. None of the Metric rules would actually make people measure that small to suit the Imperial measurements and it wouldn't make sense to make the Imperials cut their inch short by 1/16 either. So I think reading them as being the same is the most practical thing to do and what is intended.
If if your opponent doesn't buy that though, pg. 25 of the Rulebook has Charges and Control Zones paragraph 3, which states that once a model enters a control zone for the purpose of charging an enemy model, it ignores other control zones. Thus, making the whole 0.4mm issue moot anyhow.
That my two cents on it all anyway. Hope it was somewhat helpful.
_________________ "Draw your sword with a heavy heart, but swing it with a heavy hand"
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