I've used dango-envelope in several projects so far (thanks for all the hard work!). Recently I tested it in combination with django-floppyforms on this website. I had to change just one import to django-envelope for this to work.

I was wondering if integration of floppyforms into the base django-envelope project would be a good move?

If it's a good idea... There are several ways to approach this. Maybe the simplest would be an extra setting for django-envelope, used at the start of envelope/forms.py:

if ENVELOPE_USE_FLOPPYFORMS:
    import floppyforms as forms
else:
    from django import forms

I look forward to your thoughts/comments on this idea.