[Zen Cart] .htaccess and readonly-htaccess
Re: [Zen Cart] .htaccess and readonly-htaccess
It should be blank file with no extension named "readonly-htaccess".
Re: [Zen Cart] .htaccess and readonly-htaccess
I am not sure if I understood you correctly, but yes you can edit .htaccess file.
Re: [Zen Cart] .htaccess and readonly-htaccess
If you need to redirect Ultimate SEO URL, all you need to do is to put their Rewrite Rules after RewriteBase line.
Re: [Zen Cart] .htaccess and readonly-htaccess
It will work fine.