Hi,
There are no short term plans to add this. SimBrief does not plan or consider the weight distribution in the aircraft, since it makes no difference from a flight planning perspective.
In the real world, final weight distribution and stab trim setting is a load planning function that is done much closer to departure time (after all passengers and cargo is boarded). It is not typically handled or even considered at the flight planning stage.
Add to this, that it would be a huge job to collect all of the weight and balance zones and CG tolerances for all of the aircraft types and each individual aircraft add-on variant. And there would likely end up being mismatches most of the time anyways, since many add-ons randomize the zone weights when setting the payload (with no way for the user to go in and manually adjust them after the fact).
See also:
Best regards,