I came here for exactly the same issue.
Most desktop calendars have this problem, and I don't get it. If I want to count e.g. 5 weeks forward from a given date, there's always a painful jump, and I have to reorient myself to make sure I don't lose track of where I was.
Same thing for the multi-week view: I'd love to simply be able to smoothly scroll up or down, rather than having the whole view jump by 1/3 of the screen height. I suppose that there may be a difficulty because smooth scrolling requires the view of the next and previous few weeks to be pre-loaded, as opposed to generating the view on the click of the forward/backward button, but I absolutely wouldn't mind a small stutter/delay in the scrolling if it means I can keep my finger on a date while doing so.