Return of Capital transactions can be entered as Return of Capital transactions into your Investment register. In your Investment Transactions register, I suggest the "multi-line" format rather than the single line format. You can toggle that mode with Ctrl+T.
Some transactions I download via PocketSense come in that way.
Distributions sometime get recharacterized, and that might be in the following February. The changes as know are included in your 1099-DIV. This will make Money's original transaction entry to be superseded, so expect there to be some difference in what your Money reports show, and what your 1099 shows. I don't bother trying to go back to the original Money transactions to amend them.
Corrected 1099s can be issued for late-arriving changes.
So I have nothing clever to offer, unless you were not familiar with Ctrl+T.