The way Blender allows you to zoom in and out on the timeline is so easy and quick. This would be such a time saver to have in iclone.

*edit*
I just realized if you hold down shift and zoom it'll zoom in and out with the mouse wheel. The only difference is that blender zooms where the mouse cursor is, where as iclone zooms where the timeline header is.

Try the Alt key. It also lets you drag the timeline around in its window.