Here's the way I look at it (applies to Mossie also) -
Was it usual for them to take-off without ord?
In the Mossies case a definate no, although Tse Tse version is the exception.
If it was usual for them to roll without ord, then give that option. If not then leave it as it is.
By removing the ord neccessity (if it was unusual to roll light) from the A-20 you are making it a P-70, a night fighter.
Same goes for the FB VI, by removing the ord necessity you'd be making it one of the NF's, another night fighter.
In that case why not just remove the ord necessity for buffs also.
As I said way at the start, it could open a big can of worms.