Shipping - open options without calculating an amount

On the web site I've been maintaining due to the fact there are so many product items (16,000+) of all various sizes and weights, the actual shipping amount is calculated after the items are packaged up.  Since most of the items are limited quantity items of only 1 in stock and were also added before migrating over to NOPcommerce, it's financially not feasible to go back and add measurements and weights to all items.  With versions 3.8 and previous, we could leave shipping at 0 and told the customer it would be calculated when the package is shipped.  With version 3.9 it requires that the user select a shipping option and it calculates it in.  Another instance where it would be useful to have a more open ended shipping option is when a customer wants items shipped on their account.

Is there anyway to have an open form of shipping like in version 3.8 or below in version 3.9?

Thanks for any help

With 3.90, you should be able to achieve the same you did in 3.80.  It's probably just some setting.  For example, you can use FixedRate (which is now called Shipping.FixedOrByWeight), and change this setting to true:  shippingsettings.bypassshippingmethodselectionifonlyone

RE: "when a customer wants items shipped on their account."
It can't be done without customization.   We did such for a client for a prior version, and plan to make a noptools.com product out of it within several weeks.