Theme Horse

Hi Tuck,

Below are the answer to your question.

1/2. Yes you have to purchase the plugin individually and have more control of the slider controller button.
3. To change the slider to show full width text instead of adjusting the text to left/right only Go to Appearance -> Theme Options -> Design Options Tab -> Custom CSS paste the following CSS code and Click on save all changes button:

.featured-text {
    bottom: 30px;
    top: inherit;
    right: inherit;
    width: 94%;
}

4/5. Sorry you can not change the different text instead of excerpt in posts/pages. It needs code customization you have to hire a developer for this.

Thank you!