Decimal in Product Quantity (inventory/stock)

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My client sells flooring - carpet, hardwood, etc - by the square foot. I've installed the Custom Quantity plugin to allow a customer to purchase a quantity with a decimal, but is there a way for me to set an inventory quantity in the product to include a decimal? And, then to maintain the remaining inventory to the decimal when the client purchases to the decimal?

Hi,
On behalf of our client we run a daily csv import of product quantities from his ERP.
The client uses decimal quantities and as the stock quantities on hikashop are a whole number, the client asks us to implement a floor function.
What would be the quickest way to do this? Which file would we need to modify etc?
Thank you!