Oh -- the subcat page.
Yes, an elseif should work...
no guarantees this is the right code, but it should get you close...
in home_main.tpl
Code:
{elseif $main eq "catalog"}
{if $category.categoryid == XYZ}
{include file="customer/main/new-subcategories-page.tpl" cat=$cat}
{elseif $main eq "catalog"}
{include file="customer/main/subcategories.tpl" cat=$cat}
{/if}
I am not certain if $category.categoryid is legit -- I know that $product.categoryid is legit and I use it (Jon has not ported the template mod to 4.1 yet, so i had to hard code it)
Basically, hard-code a clone of subcategories.tpl to look how you want it (only for one category) and let the elseif find it...
Does this help? I hope so...