Hi Richard,
I am very sorry that this email went unnoticed for so long! I'll try to answer your questions as best as I can.
1. You can do either! Once Forge has generated views, you are free to modify them yourself - just be aware that if you re-generate any views with Forge, your changes will be lost! So generally don't re-generate views you've already changed.
2. Same thins as the above, you are free to modify any classes once Forge has generated them.
We are still working on the generation itself so that files can be extended at generation time.
I hope this is the (very late) answer you were looking for!
~Lincoln