When selecting a 23.976p or 24p project, you are truley editing at those rates and the capture process reverse telecine’s the NTSC footage on the fly.
You cannot capture 30i material and edit it in the same timeline. If you are going to mix frame rates, you will want to be in a 30i project type – the 24 frame material will have pulldown in it preserving the “film look” while allowing your interlace, progressive, and frames rates to be edited together.
You can mix NDF and DF in the product with no problem, you just can’t have the same tape name when capturing have both NDF and DF.
Michael