MC4 allows you to use NTSC footage in PAL projects, instantly. You need to capture your PAL footage in a PAL project, and your NTSC footage in an NTSC project. Metadata is tracked as usual. If you open a bin with NTSC footage in a PAL project, you can instantly use it like you would any other footage, with sync sound travelling along. What happens is that a source-based TimeWarp effect is automatically applied. It runs in the source monitor, you can splice it into the record monitor, and you will see a small green dot in the timeline for the NTSC clips in a PAL project. The source timewarp effect defaults to the right playback speed, with Blended Interpolated as the default setting. You can promote the effect and alter any and all parameters like you would be able in any other type of project.
As to pulldown, it’s not really pulldown (that would be sequential), it is a blended interpolated motion effect. If you were to import frame by frame, then add a blended interpolated timewarp effect, you would get the same result.
If you have been working in a PAL project with NTSC footage, then decide you need an NTSC playout, you can open your sequence in an NTSC project, and as soon as you double click the sequence it will be copied to an NTSC version, and instantly all NTSC footage will play back in its original format, and all PAL is being timewarped to 30i.