r - rhandsontable で列の編集を無効にしますか?

Question

次の光沢のあるアプリがあるとします。

library(shiny)
library(rhandsontable)

ui <- shinyUI(fluidPage(
  titlePanel("Handsontable"),
  sidebarLayout(
    sidebarPanel(
      helpText("Handsontable demo output. Column add/delete does work ",
               "for tables with defined column properties, including type."),
      radioButtons("useType", "Use Data Types", c("TRUE", "FALSE"))
    ),
    mainPanel(
      rHandsontableOutput("hot", width = 350)
    )
  )
))

server <- shinyServer(function(input, output, session) {
  values = reactiveValues()

  data = reactive({
    if (!is.null(input$hot)) {
      DF = hot_to_r(input$hot)
    } else {
      if (is.null(values[["DF"]]))
        DF = data.frame(val = 1:10, bool = TRUE, nm = LETTERS[1:10],
                        dt = seq(from = Sys.Date(), by = "days", length.out = 10),
                        stringsAsFactors = F)
      else
        DF = values[["DF"]]
    }


    values[["DF"]] = DF
    DF
  })

  output$hot <- renderRHandsontable({
    DF = data()
    if (!is.null(DF))
      rhandsontable(DF, useTypes = as.logical(input$useType), stretchH = "all")
  })
})

# Run the application 
shinyApp(ui = ui, server = server)

最初の 2 列の編集を無効にするにはどうすればよいですか?