One doesn't have to tag files 1 by 1, there are several programs to make the task faster in mass, including JRiver.
APEs can be converted to FLACs in foobar.
SACD ISOs can be coverted to dff with ISO2DSD software.
I am sorry for those who are missing out this great DAP because of these small shortcomings. A few hours managing the library and all would be fine.