It is possible using tabList. Here's some code which does this and sets all properties at the same time. "with" does NOT set properties at the same time and should always be avoided.
var myParagraphStyle = app.documents[0].paragraphStyles.item("Verse");
myParagraphStyle.properties = {
tabList:[
{
position: 5,
alignment: TabStopAlignment.CENTER_ALIGN,
leader: ""
},
{
position: 10,
alignment: TabStopAlignment.CENTER_ALIGN,
leader: ""
},
{
position: 15,
alignment: TabStopAlignment.CENTER_ALIGN,
leader: ""
}
],
appliedFont: "Lexicon No1 A Tab",
fontStyle: "Normal",
pointSize: 8.75,
leading: 10,
alignToBaseline: true,
justification: Justification.LEFT_JUSTIFIED,
keepFirstLines: 2
};
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