• Makes Nibbler work more-or-less correctly with Stockfish and maybe other A/B engines.
• Nothing magical can be done about the fact that MultiPV is inherently crippling to A/B engines, but you can choose a low MultiPV value (see the menu item Dev --> A/B MultiPV). This menu item does not affect Leela.
• Filtering arrows is disabled for A/B engines; the number of arrows will be the MultiPV choice.
• In several ways the overall experience is still nicer with Leela.