message: center/focus with left+alt
diff: @@ -16,7 +16,10 @@ const M = ModifiersKeys
  const Trigger = Binding.Trigger
  const DefaultFocusLociBindings = {
  - clickCenterFocus: Binding([Trigger(B.Flag.Auxilary, M.create())], 'Center and focus the clicked element using ${triggers}.'),
  + clickCenterFocus: Binding([
  + Trigger(B.Flag.Auxilary, M.create()),
  + Trigger(B.Flag.Primary, M.create({ alt: true }))
  + ], 'Center and focus the clicked element using ${triggers}.'),
  }
  const FocusLociParams = {
  minRadius: PD.Numeric(8, { min: 1, max: 50, step: 1 }),
  