Zoom, no, the zoom in LR is by steps, not linear
Can 'Automatic' White Balance and/or 'Automatic' Tint implemented as automatic import setting or automatic development pre setting?
Start with a photo in Develop that has WB: Auto set. Create a Develop preset named "WB Auto" with just the option White Balance checked. Then in the Import window's right column, set Apply During Import > Develop Settings to WB Auto.
Now when you import photos, the WB Auto preset will be automatically applied.
Thanks John Rellis.