Hello,
That would be a shame that the admin cant configure a value in which is a partial amount (either in percentage or a value) of the full price as that's usually how pre-order works.
The pre-order plugin allow to have a specific quantity that you allow to sell even if you do not have that stock.
But the payment part is related to the payment platform, I'm sure that you understand that it will be almost impossible that all HikaShop payment plugin will be compatible with a system which will allow the customer to pay one part of the order at start, and the rest... later (and we don't even know when it should be).
I don't see what could be misleading in the sentence wrote in the description.
The pre-order plugin take a value for the quantity stock that you authorize to sell without having the stock.
So the customer can pre-order for the value you have configured.
But you wrote the same thing :
3) qty available for pre-order. So that allows dealers to set a limit as to how many orders it can take for this item before closing.
Your "limit" is just the value of the available pre-order stock. Which is, the main (and only) goal of the plugin.
I would rather recommend you to use an "authorize/capture" payment plugin for your payment need.
That is not the goal of the pre-order plugin and if I add such kind of feature, it would be a new plugin with another price.
Regards,