This would be an absolute game-changer of an enhancement and would significantly alleviate a ton of work in excel spreadsheets handling prepaids and accruals. Ive been meaning to post this exact thing, and i hope they are listening to you. Literally if i could pick one enhancement it would be this.

My solution for the "out-of-balance by period" issue that would arise is this: make a new control account that handles any inter-period accruals and have them occur on the back-end, similar to the way intercompany entries work. So if your regular AP account is 2000, the "Inter-period Accrual Clearing Account" might be 2001. That way, users just enter the date they want for each line item. In GL Distribution you assign a date to each row, and when the invoice is posted the Inter-Period entries happen for you.

This is common in other accounting systems like MIP