Is it possible to resize shapes or move shapes without aligning to pixel grid in Sketch 3? I can use real numbers to set size like 34.5 but when resizing in convert size or position to integer numbers.
Yes, it is, and it is quite simple.
Go to sketch > preferences (on a mac press cmd + ,), and under the first tab (General), uncheck the first box (says "pixel fitting: Fit layers and points to pixel bounds").
Hope it helped.