Documentation for JIRA 5.1.x. Documentation for other versions of JIRA is available too. 
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To work around the fixed size of a comment field, edit <jira-install>/atlassian-jira/WEB-INF/classes/templates/plugins/fields/edit/edit-textarea.vm.
$!rendererParams.put("rows", "2")
In this example, the custom field's id is 10220. You can get this value from editing the custom field and checking the URL.
#controlHeader ($action $customField.id $customField.name $fieldLayoutItem.required $displayParameters.noHeader)
#if ($!customField.id=="customfield_10220")
## setup some additional parameters
$!rendererParams.put("rows", "2")
$!rendererParams.put("cols", "40")
$!rendererParams.put("wrap", "virtual")
## let the renderer display the edit component
$rendererDescriptor.getEditVM($!value, $!issue.key, $!fieldLayoutItem.rendererType, $!customField.id, $!customField.name, $rendererParams, false)
#elseif ($!customField.isRenderable() && $rendererDescriptor)
## setup some additional parameters
$!rendererParams.put("rows", "2")
$!rendererParams.put("cols", "40")
$!rendererParams.put("wrap", "virtual")
## let the renderer display the edit component
$rendererDescriptor.getEditVM($!value, $!issue.key, $!fieldLayoutItem.rendererType, $!customField.id, $!customField.name, $rendererParams, false)
#else
<textarea name="$customField.id"
id="$customField.id"
class="textfield"
rows="4" cols="40" wrap="virtual"
>$textutils.htmlEncode($!value)</textarea>
#end
#controlFooter ($action $fieldLayoutItem.fieldDescription $displayParameters.noHeader)
There is a feature request to allow this cusomtisation from within JIRA at JRA-20248.