Hi Oliver,
With spoken checklists it depends upon what the voice actor had recorded. It seems like you have managed to work around some checklist items not in the repertoire.
As for flows in unsupported aircraft. Provided the aircraft has native FSX commands, you can put flows together using the native commands that come with MCE. I did an amateurish "how I do it" video that's on my You Tube site, where you can see me putting flows into the DC2. The DC2 uses native FSX commands for the most part, so it's fairly straightforward.
If there are any commands you can't see, in the FSX native list, then I just use the "Vox Key" program that also comes with MCE. With Vox Key you can say anything and assign a keypress or a combination, so it's a win win!
You can get MCE to say anything that's in a wav file, by playing back sounds. It's possible to structure some interesting replies using that method, a triggered response if you like.
Cheers.
David.