What features would you like to see in Pixelmator?
When zooming in using the keyboard shortcut ("cmd"+ "+"/"-") I would expect the zoom to focus on the area that the cursor is resting on. If the cursor is not present then just zoom as Pixelmator presently does, but usually the cursor is resting on the area the designer is focusing on.
I'll add it to the feature request list and, in the meantime, I'd suggest using the Zoom tool to zoom in on a particular area. To do that, press to Z key and click the area on which you'd like to zoom in. You can also Option-scroll using the mouse while the Zoom tool is selected and, in that case, it will zoom in on the area your cursor is resting.
Both existing options do for what I need, many thanks for that information.