This is the simple script that I'm using to reduce to a comfortable size edit textarea in nsPage, it "sniffs" too layout toggling:

function resizeBox () {if ((wgCanonicalNamespace=="Page" && (wgAction=="edit" || wgAction=="submit"))&& $(".wikiEditor-ui-left").css("width")==$("#wpTextbox1").css("width"))

{$("#wpTextbox1").attr("rows","10")} else {$("#wpTextbox1").attr("rows","31");}

}

$(document).ready(function () {

$("img[rel='toggle-layout']").attr("onclick","resizeBox()");

resizeBox();

}

);

Rough, but running. :-)

Alex