We do not offer a trail license as once you have the code, you have the product and there isn't anything we can do to ensure that you wouldn't continue to use it. We've tried encrypting the code, but the support for getting that code to run using the Zend encoder was significant.
All strings are contained in a language file which you can easily modify to change the wording.
Search Engine friendly URLs is an option that can be turned on with a switch.
Additional fields can be added for each category in the Admin section.
And, lastly, you can easily modify the templates to include ads - say in the header or footer templates. Most users include these on their sites.
Please do not PM me for support or sales questions. Thank you for your understanding.