In the real world my wife and I maintain two non-registered joint investment accounts. All funds in the 1st account are attributable to me.  All funds in the 2nd account are attributable to my wife.
I pay the dividend and capital gain taxes for the 1st account.  She pays the dividend and capital gain taxes for the 2nd account.
The sole reason for maintaining the "joint" designation on these accounts is to avoid eventual probate fees.

How do I model this in the MoneyReady App?
For the 2nd account I tried setting "Percentage of account my_name contributed to" to 0 percent, but when I do that, this field always reverts to 50 percent. I then tried 1 percent but it did not have the desired effect.
For this year (2024), the TIME MACHINE always expects me to pay all of the dividend taxes for both accounts.
For next year (2025), the TIME MACHINE shows my wife paying a small percentage of our combined dividend tax, but it is still far below what her share should be.
I tried to model the accounts as "individual" instead of "joint". That solved my issues, but it ultimately leads to unwanted probate calculations when the first spouse dies.

I don't see the $2500 death benefits for either spouse when I run the TIME MACHINE.  When one spouse dies, the other spouse should normally be able to claim $2500.  When the remaining spouse dies, the estate should be able to claim another $2500.

This probably won't impact anybody's retirement planning because the amount of money is small and it is not tied to inflation.  Also, the money theoretically should be used to cover funeral expenses and I expect most people don't itemize those in this tool.  I am therefore not desperate to see death benefits added to the TIME MACHINE; I am only pointing out that they do not seem to be there and I found no reference to them in the eBook.  In general I am extremely impressed with the amount of detail that has gone into the TIME MACHINE!