Removing pre-1930 dates was actually a bug-fix, and not a "removal" of a feature. Along with the other fixes so the dates would roll over correctly. That stopped date selection screw-ups the old system allowed.
If you guys are really serious about the WW1 mod, then I
could be persuaded to make a one-off 1914-18 mod to the exe, remove the WW2 LC, and a
very few changes to batloc maps, batlocs etc (perhaps). Just the EXE - OOBS, SHP changes etc all up to the group, and
no maintenance of the thing either. Or support by us. Or changes to the AI pick (your OBATS would have to work around those, as any changes to that would need a man-month probably, which is time I don't have). I think I can budget a man-week on the EXE changes (nothing complicated

)
Do any of your group belong to the winSPWW2 playtester's group? (or know somebody there who can pass messages) - if so, drop me a note on there.
No promises - but it may well be possible
if it is not going to take any of my time.
Cheers
Andy