In your editlink_edit_center.tpl, replace line 54
PHP Code:
<br/><textarea name="bodytext" rows="10" cols="60" id="bodytext" WRAP=SOFT onkeyup="if(this.form.summarycheckbox.checked == false) {ldelim}this.form.summarytext.value = this.form.bodytext.value.substring(0, {$StorySummary_ContentTruncate});{rdelim}textCounter(this.form.summarytext,this.form.remLen, {$StorySummary_ContentTruncate});">{$submit_content}</textarea><br />
with this
PHP Code:
<br/><textarea name="bodytext" rows="10" cols="60" id="bodytext" WRAP=SOFT {if $SubmitSummary_Allow_Edit eq 1}onkeyup="if(this.form.summarycheckbox.checked == false) {ldelim}this.form.summarytext.value = this.form.bodytext.value.substring(0, {$StorySummary_ContentTruncate});{rdelim}textCounter(this.form.summarytext,this.form.remLen, {$StorySummary_ContentTruncate});"{/if}>{$submit_content}</textarea><br />