[Rune Jacobsen] ” I will have to actually do something to cause it to become 1920, right?”
Drag the video to the new item button and it should create a timeline with the proper settings. Or you can make a custom 1440×1080 sequence and choose the HD anamorphic pixel aspect ratio.
[Rune Jacobsen] “But will this actually cause ever so slightly slower video?”
It will change the lenght of the clip because it’s running slower. Basically it just runs the video at the new framerate showing every frame. It’s not dropping or adding frames. If you have a 24 fps sequence and you cut 30 fps footage in it then it will drop frames, but it will run the original lenght.