I think that the reason for the WT corporation to forgive all congregation loans for KH was that technically they are not qualified legally to be in the money loaning business that charge interest and secondly they own the KH even though the congregation forms a corporation with local elders and special by-laws (that give all control to the WT) so that basically they own it and receive the money if it is sold. I'm sure their is something very illegal about the whole thing and forced the GB to forgive all loans.
I think the removing all contribution box designations for specific funds has ceased and now pretty much everything is labeled for the worldwide work which gives them less book keeping head aches and allows them to use the money for what ever.