@wc_sumpton I see you are right.
I said that this option could have been hacked in a number of ways, and it looks like it has already been. This mod starts as default with Russians having a series of movement restrictions, then clearing all them and setting the Type to disallowed before the "Combat" phase of the first Russians turn.
Beside the fact that the "Classic: Iron Blitz 3rd Edition" mod is much redundant with respect to the fact that many of its options are already available in regular 3rd Edition, so I've doubts that this mod should even exist at all, instead of just the 3rd Edition having all the "Iron Blitz" options available (and, if it should, then it should be part of the World War II Classic map itself, which it isn't featuring it), this (the fact that the "Iron Blitz" mod is, apparently, the only one offering the "Russia Restricted" option) doesn't make any actual sense, as the Russia Restricted option is actually supposed to be an option for all Classic games since the 2nd Edition (so nothing specifically to do with any "Iron Blitz" related modding).
CC: @redrum @LaFayette @RoiEX @Panther for the incongruencies I'm pointing out.
EDIT:
I also see that the "Classic: Iron Blitz 3rd Edition" mod is forcing you to play with the additional "marine" and "destroyer" units. @wc_sumpton Since I cannot see a way not to have such units (is there any?), with also the added wierdness that you have an option called "Use Destroyers and Artillery", while "destroyer" is already in the game regardless, I suppose that, if he wants to play by regular 3rd (or 2nd) edition rules, with the Russia Restricted option only on top of them (thus without marine and destroyer), this mod is not a solution for him. Am I right?
I also see that there is a "Classic: Iron Blitz 2rd Edition" mod too. Assuming "2rd" means "2nd", I can only guess this is a mod of the mod (Iron Blitz) of the mod (3rd Edition) of the the original Classic game reintroducing general 2nd Edition rules back together with the "Iron Blitz" specials (for example, having 2nd Edition rules but also having the marine and destroyer units). This seems very weird to me, if I'm even correctly understanding the matter (and, on top of this, the TripleA program is not fully implementing and distinguishing 2nd and 3rd Edition Classic rules, anyway).
Does TripleA actually need 4 different versions of Classic? Is this confusing to me only?
Also, is it correct that in "Iron Blitz" you must play with the additional "marine" and "destroyer" units (they are a default element of the game, as a change from the 3rd Edition before Iron Blitz)? Is adding "marine" and "destroyer" the only one difference between the original 3rd Edition and the Iron Blitz sub-version of the same? I think so, but not sure.