Limbic~Region, demerphq, and others in that discussion have already expressed an idea which has been, in the thread and CB, determined to be qualitatively different from the idea that TimToady is implementing called 'lvalue subs'. This is especially apparent in Re^6: Experimenting with Lvalue Subs.
Hopefully, those who want to have this feature added to Perl will hash out their ideas here. The goal, as I see it, is to end up with something that can be submitted to TimToady as a new feature - a complete RFC, so to speak.
Chat away!
Being right, does not endow the right to be rude; politeness costs nothing.
Being unknowing, is not the same as being stupid.
Expressing a contrary opinion, whether to the individual or the group, is more often a sign of deeper thought than of cantankerous belligerence.
Do not mistake your goals as the only goals; your opinion as the only opinion; your confidence as correctness. Saying you know better is not the same as explaining you know better.