If you wish to deploy template with t3 framework, You can always follow userguide which could let you know about the extensions which have been deployed for the template along with their configuration. Also, You can know about the positions specific modules have been assigned to just in case, if you wish to add in module similar to demo template 🙂
<blockquote>I wanted to know if i will be missing out on any extra features from JA Teline IV if i install just the template on the JAT3, just incase i want to add on other extra features as featured on the demo for JA Teline IV?</blockquote>
Not as such as you can always follow userguide to get particular extension which is being displayed. Mainly, Quickstart gives you replica of demo template.
Also, Do check in wiki guide of T3 framework (link in my signature) to know about how it can be beneficial in powering the site 🙂
Hope this helps
Cheers