With the latest binaries from the service pack (which will be released today or tomorrow) the second issue you described should exist no more (0 value label formatting). We had already identified this as a problem and fixed it. So I will suggest you upgrade when the SP is released. If you cannot upgrade I can suggest a work around that includes a label template and a string format.
About the first question you have (axis not including zero) - we have identified this as a issue as well and we have plans to implement some alignment-value feature. With it you will be able to declare that you want the labels to be zero aligned. Currently this is not possible and you need to set a manual range - min, max and step.
Let us know if you need more information.
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