TCGPlayer Derived Pricing "CustomPrice" Column

It would be great to have a new column for inventory and lists, say “CustomPrice“, where one can apply valuation based on TCG player low, mid, high or market prices as well as using a custom formula such as TCG player price multiplied with custom scalar (low price 1.2 or market price * 0.9 etc). Furthermore, it would be great to obtain the sum total of this column - perhaps at the top of the page next to the TCG Player market price estimate, with a tooltip showing the formula used, so it is transparent for potential buyers - and allow us to get total values based on selected subgroups (select n-cards and get their total valuation according to the base and custom methods). Ideally, we could choose to get these values for the entire inventory/list/selection either as is (counting every multiple of each card owned towards the total) or in a “single-item mode” where we assume that each card listed/selected is owned exactly one time. I understand this last part can be replicated with lists, but having a toggle switch in all modes would be very handy, albeit not essential. Thanks!