In certain circumstances, the amounts in Box 20P can be considered taxable income and/or unrelated business income. This can be seen in certain K-1 footnotes. A checkbox for Box 20P to include the amounts in either taxable income or UBI would be treated similar to Box 20T Depletion.
K1X is currently working to improve the usability and design of our K-1 products. Once that work is complete, we will be reviewing ideas such as this one to implement in that new experience.