Adam,
at older Cuteeditor i have made following Changes to control the width of textarea:
Private Sub editorStylesheet ()
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t = t &".editBox {BACKGROUND-IMAGE:URL('"&session("cmsBackGroundImage")&"'); COLOR:#"&session("cmsTextColor")&"; FONT-SIZE: "&session("cmsFontSize")&"; LINE-HEIGHT: "&session("cmsLineHeight")&"; FONT-FAMILY: "&session("cmsTextFont")&"; BORDER: #c0c0c0 1px solid; BORDER-RIGHT-WIDTH:"&session("cmsPaddingRight")&"; PADDING-LEFT: 10px; PADDING-RIGHT: 10px; PADDING-TOP: 10px; PADDING-BOTTOM: 10px; MARGIN: 0px 0px 0px 0px; OVERFLOW: auto; BACKGROUND-COLOR: #"&session("cmsBackground")&"; TEXT-ALIGN: left}"
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I set: BORDER-RIGHT-WIDTH:"&session("cmsPaddingRight")&"