Funny, in a couple of interviews, I saw her trying to talk up a storm spinoff movie.
Ironically, it looks like her idea went the other way, with a probably wolverine spin off.
Regarding the accent, the director was there, he should have simply either dropped it, or had her do it the whole movie through. He is paid to direct, Singer isn't exactly new, and Berry isn't known for being a pain.
She has already stated enthusiasm for doing another x-men movie.
I'll find the link if you want me to, but suffice it to say the fan base was mightily pissed off at the time.