In sencha touch 1.x it is also possible. When creating list you can specify:
disableSelection: true/false,
multiSelect: true/false,
allowDeselect: true/false,

And you can also select/deselect from code, using SelecionModel:

var SM = list.getSelectionModel(); // list = some Ext.List component

SM.select(0); //selects an item specified by index
SM.deselect(0);
SM.selectAll();
SM.deselectAll();