I would like to have Lot quantities autoassigned on Manufacturing Orders:

I found 2 modules:

stock_picking_transfer_lot_autoassign does exactly this but for pickings only.

mrp_auto_assign reserve raw materials but doesn't work for lots.

Any suggestions?

When working with lots, it's very uncomfortable to introduce the quantity, lot by lot, when transferring pickings (when doing MO too) from your warehouse.