There is no software tool (editor) that NETGEAR has released to edit the text config file of NETGEAR switches. You may want to post your concern as product request in the Idea Exchange for Business board here. In this way, the development team can see what software does users wanted. Be informed that the more kudos given by community members to your product request will help as the development team will be reviewing the post that has the most kudos and will be considered.
