FCS, it would be a small number on the Vref, in the case of Adam, I guess someone figured it out that to add that weight would affect the speed attaining positive rate by a negligeable margin... and shouldn't affect approach handling... otherwise the pilots would notice. The "culprits" have been said to set such a limit also to keep CG within the 'expected'.
Now to add to the story, yesterday an Adam Air 732 RTB'ed, after something got stuck, either the flaps/slats or stabilizer. pax reported hearing "a horn like explosion", but that was denied by the company, whose official word was "something wrong with the slaps (yes, they said slaps), the horizontal piece behind the wing, that it would not go to 5 degrees"... Whatever that means...
A release came out on KKV, today stating that "no structural weaknesses were found", either that was in reference to the condition of the aircraft before the incident or after, I dunno, I hope the former though...
PK-KAR