It's the same with all airmouses and I couldn't find any solution for Chrome. The biggest issue is, that even if I switch Chrome to desktop view, there aren't even any side scrolling bars, like on PC. So you must use simply the up-down buttons to scroll (in much harsher steps) on the pages. I guess it's because Chrome is programmed this way, to behave like it should in the case of a normal PC mouse, not respecting the control specialties of an airmouse. In this case what's missing from the airmouse is a dedicated scroll caster.
But in Firefox it works fine as scrolling instead.