Issue 1, "Negative Value Toxic Dust" seems like much ado about nothing. It's only in vary rare cases that you will run into this, and most of the time the toxic change amount is too significant to simply roll into the miner fee. If anything this is a feature request.

Issue 2, "Coordinator Fee Address Reuse" this feels like a stretch calling it a bug. So what if the coordinator is reusing addresses? Not like it impacts users in any way.