Actually the LHTR Heavy Bombers option only gives +1 to total SBR damage on maps where the xml is configured in a certain way.
In Global 1940, it does NOT give any bonus.
Therefore, it is fully rules compliant.
Let me give a quick run down of the options:
Triggered Victory = victory for axis if they own 8 vc in europe half, or 6 vc in pacific half. victory for allies if they own w/e the rules say they need to own (i forget).
Honorable Surrender = if triggered victory is off, and honorable is on, then instead both powers will use ‘total vc’ for the whole map as a victory condition. the total needed are in the boxes below this.
Low Luck = LL for all combat, including AA guns
LL for AA only = LL only for aa guns
LL for Tech
LL for bombing and territory damage
Tech Dev = on/off
Remove Tech Tokens at end of turn = if turned off, you keep your tech tokens until you get a tech
Super sub bonus = super subs technology, do we want to give a bonus to defense also?
LHTR HB = if on, we pick best die. if off, we use all dice.
Kamikaze Airplanes = air can use all their movement to get to a battle. no need to consider a landing space.
Use Kamikaze Suicide Attacks = those 6 japanese kamikaze attacks in Global 1940
Two hitpoint units require repair facilities = do we need to be by a harbor to repair?
Scramble rules in effect = scramble on/off
Scramble units return to base = if off, they can move somewhere else after scramble.
Scramble to sea zone only = if off, they can scramble to adjacent land attacks too (i think)
Scramble from islands only = original rules say you can only scramble from islands. now you can scramble from coasts too.
Scramble to any amphibious assault = originally rules say you can only scramble to defend against an amphib assault on the scrambling territory. new rules say you can scramble to defend against any amphib assault.
Units can be changed on capture = factory major becomes minor after being captured
choose AA casualties = if on we pick our casualties for AA. if off, they are picked randomly.
units may give bonus movement = airbases and naval bases give +1 movement
convoy blockades roll dice for cost = if on we roll dice. if off, we do 1 damage for each die we would have rolled [perfect average]
unit placement restrictions = can’t place certain units in certain places (ex: no factories on islands)
raids may be preceeded by air battles = allow intercepting and escorting for SBR