Decimal value for quantity I need to accept a decimal value for the quantity of a line item and for the total quantity. I understand this is not a normal request for most products but my client sells items by the foot and needs the flexibility to sell lengths in feet and inches (ex. 10 ft. 6 in. = 10.5 or 5 ft 6.5 in. = 5.541. I could probably hack this using JavaScript on the front-end but would like to do this the correct way. Any guidance is greatly appreciated. Has anyone achieved this?
You could build a plugin that listens to https://craftcommerce.com/docs/events-reference#commerce_cart.onbeforeaddtocart and translates the front end values of 10.5 or 10'6" or whatever into the number of inches (or, if you're working in a sane part of the world, even cm!).

Then on display of the cart or updates etc, you'll want to use some JS and/or twig maths to translate that back into those crazy feet/inch units you need there.

I honestly think trying to retro-fit in partial unit sales into Commerce as a whole would be quite a considerable challenge, so I think the best way to solve this is to use your smallest unit as the back end unit of quantity for the product, and do the magic in your plugin/and display.