I have another possible item for the wishlist (I've been thinking of this for some time):
At the end of each module would it be possible to add some text or audio in the target language, tailored to the level completed, for entertainment and consolidation? It probably shouldn't count to the points?
(This is more of a 'language' type wish than a technical wish.)
For the first two or three modules it might be simply some variation on the dialogues, perhaps with any new vocabulary presented up front, but for the later modules it could be authentic French (or whichever language) from a novel, newspaper, or whatever (which might involve copyright issues), again chosen for the level currently achieved.
An example of a theme where it could be useful (from my own French studying) is after reflexive verbs are introduced: examples of sentences are provided, even related, but some more instances would surely help.
I realise this could mean a lot of work for the tutoring staff rather than the technical guys, so I accept I might be disappointed in this!
Apart from this I agree with the OP, Rocket Languages is excellent!