I wish I had more control over Structure output

output1.html

<!-- Basic output -->
<ul>
{exp:structure_output:nav depth="2"}

<li class="{if struct:first}first{/if} {if struct:last}last{/if} {if struct:here}here{/if} {if struct:parent_here}parent-here{/if}">
  <a href="{struct:url}">{struct:title}</a>
  {if struct:children:count}
  <ul>
    {struct:children}
  </ul>
  {/if}
</li>

{/exp:structure_output:nav}
</ul>

output2.html

<!-- Classes got verbose. Simplify them? -->
<ul>
{exp:structure_output:nav depth="2"}

<li class="{struct:classes}">
  <a href="{struct:url}">{struct:title}</a>
  {if struct:children:count}
  <ul>
    {struct:children}
  </ul>
  {/if}
</li>

{/exp:structure_output:nav}
</ul>

output3.html

<!-- Custom fields -->
<ul>
{exp:structure_output:nav depth="2"}

<li class="{struct:classes}">
  {if struct:channel == 'external'}
    <!-- Use a custom field -->
    <a href="{struct:external_url}" rel="external">{struct:title}</a>
  {if:elseif struct:channel == 'something'}
    <!-- Use a custom field -->
    <a href="{struct:url}"><img src="{struct:something_img}"></a>
  {if:else}
    <a href="{struct:url}">{struct:title}</a>
  {/if}
  {if struct:children:count}
  <ul>
    {struct:children}
  </ul>
  {/if}
</li>

{/exp:structure_output:nav}
</ul>