this is a copy of the message I posted in the support group but I've added updated the scope of it.
I've been waiting for split transaction so I was really happy to see you implementing it.
Being able to enter negative amount in the Split Detail Dialog would be usefull to enter pay checks for example. One split would be the gross salary for that month, other splits would reflect deductions for taxes, health care insurance, etc...
Another feature that would be interesting is to be able to transfer money to an account from a split transaction. Once again the example of the pay check is relevant. Alongside the splits refered above, money is deducted from the gross salary and going toward a retirement account. Of course this retirement account is tracked with MMX.
So within the same transaction, some splits would be transfers and/or simply assigned to categories, and all could be either positive or negative.