These are probably not considered essential fields by us, or by most customers, but would be quite useful to some, and are similar to fields that we have been asked to add in the past (with old v6 plugins that stop users quoting below a certain price, or qty below the minimum).
We should add this logic, at least for unleashed, but also consider being able to use this with other accounting systems (setting it in product manager for those systems that dont have those fields).
As it currently stands the fields are not available via the Unleashed API. We have logged an enhancement request with Unleashed to make these fields available.
When they update their API we will be able to progress this.
The field is now available via the API from unleashed (see attached) - we do have a field for it, but we would then need to respect that Min Qty when adding an item to a quote / order