Do not know if this is already noted:
The cards in my hand do get reordered when I decline to play an enabled card.
I had a creature card with full mana but disabled as the first card.
The second card was a sorcery to enhance a creature. This I had not disabled.
When asked to chose a target for the sorcery I did decline to play it - and it got moved to the top of my hand; instead of staying on second place.