gistfile1.txt

  Axlsx::Worksheet.class_eval do
    def add_row_with_position(values = [], options = {})
      if options.try(:[], :start_at).present?
        val = []
        options[:start_at].times { val.push nil}
        options.delete(:start_at)
        values = val + values
      end
      add_row_without_position(values, options)
    end
    alias_method_chain :add_row, :position
  end

#!/usr/bin/env ruby -w -s
# -*- coding: utf-8 -*-
$LOAD_PATH.unshift "#{File.dirname(__FILE__)}/../lib"
require 'axlsx'

Axlsx::Worksheet.class_eval do
  def add_row_with_position(values = [], options = {})
    values = Array.new(options[:start_at] || 0) + values
    add_row(values, options)
  end
end

p = Axlsx::Package.new
wb = p.workbook
wb.add_worksheet do |ws|
ws.add_row_with_position [1,2,3,4,5]
ws.add_row_with_position [1,2,3,4,5], :start_at => 5

end
p.validate.each { |e| puts e.message }
p.serialize("stack.xlsx")

greets mate- obviously you don't need the load path bit there - but I think this is what your looking todo.
Ill add an :offset option to add row that provides this functionality. definitely beats [nil, nil, nil, nil, 'real data'] stuff

yes it's sexier :D
I ll try this on monday when i m back at work and i ll let you know if ever i still get that stack too deep error message.

Anyway thanks dude! I ve been hacking into poi with monkey patching to get the kind of stuffs you bring trough your gem .. thanks