"I had to eliminate the previous $consider_free behaviour because it was breaking the expected amount checks on transactions" - can you say more about this, and link to a commit?
$consider_free was resulting in transaction checks made entirely by points to fail validation because the handler cannot convert between points and currency (either an error about unknown currency POINTS, or it improperly expected an amount of money on the transaction when it should have been 0).
I tried bug-fixing it but fixing it one way ended up breaking the system in another way. I couldn't find a fix that worked other than pulling it and implementing a skeleton to support custom discount ratios.
$consider_free was resulting in transaction checks made entirely by points to fail validation because the handler cannot convert between points and currency (either an error about unknown currency POINTS, or it improperly expected an amount of money on the transaction when it should have been 0).