I agree, the situation was different, but the technical solution is basically the same: add the appropriate presale codes back into the validation table so they may be used again.
I understand we all need to wait and see what, if any, accommodation might be made for Singapore2 presale, but I hope Live Nation/the band continue to strive to improve the technical side of the buying process (it has dramatically improved over these past 3 tours! THANK YOU) so that fans don't get stuck out in the cold due to the strategy employed when deciding to add shows.
Thanks for all you do, Mods. I