If the question is can you use both supported disk drives and put an adf in each then I believe so.

In the main menu, go to select image disk and press z. Choose the adf you want to put in the emulated internal floppy drive (df0) and press z.

You will then be taken back to the main menu screen. Press z on select image disk once again, go to the adf you want to put in the emulated external floppy drive (df1) and press x.

You will then be taken to the main menu screen again.

Press z on run or reset as normal and you should have an adf in each emulated drive.

Some demos/games only recognised the internal drive so for those the emulated external drive will not be recognised.