Another point I seem to have overlooked in the 1870 rules involved circumstances
of morale checks. Single stand units are proportionally penalized in the
rules for losses i.e., they're docked 3 from their morale grade for each combat
point lost)... but there's nothing in the rules that states when single stand
units must check their morale! A single battalion/stand could lose 2/3 of
its strength (and notionally be down by 6 morale points), but would never have to
check its morale, since none of the morale checking criteria applied (except maybe
"losses to artillery fire").
So, the fix for that (which has been incorporated into the 1859/64 and 1866
rules) is this: Two and three-stand units check at each stand loss, and
single stands check at each point loss. The exception to this is if these
small units are the survivors or portions of once-whole regiments, as noted in
the rules. They would continue to check as regiments, since the remnants
of the rest of the unit is "implied".