Sorry, for my broke english. There are few questions that I'd want to ask that got me quite confuse. I will try to phrase and describe my question the best way I could.
Starting with a bit of background.
Here comes the questions
1.) Does these kind of "theme tab" classify as plugins? if not what is it call?
2.) I'd want to try and create a theme tab which enable me to change some of the element in HTML (e.g. text or pictures), CSS (e.g. font-size, change background-image from upload media), JS (e.g. google-map lat & long, content of infowindow). Basiclly I would want my hardcode theme to be a REAL wordpress theme that enable users to change from the backend instead of looking through all the HTML or JS code. Where should i start looking at? any learning resouces that would fit the criteria that i've mention above? Right now the difficulty that I'm facing is I dont even know what to search for in google in order to narrow down the result that fits me? admin-panel? theme-tab? backend changing JS?
3.) If i want to create a custom single.php page for a specific category of post, is that possible?
Thats it for all my questions.
Many Thanks :D