Casio ex-z750

Light usage
Does the Casio need more light than my old Canon? Taking the same shot at ISO 400 f2.8 the Casio shoots at 1/15 while Canon s400 shoots at 1/30. Camera monitor indicates white balance better on Casio, is the loss of light there?
I forgot if you double megapixels you'll decrease the light.

Note taking
I've use the camera for far more note-taking than pictures. It is quick to start a new recording and can record for hours. There are issues. The sound quality is poor and the files large. It would help my organization if I could pause the recording instead of making many separate files.

Image stabilization
The camera's biggest flaw is the lack of image stabilization.