As stated for tabs, hashtag support or the ability to add an attribute id='' to the shortcode that opens the tab, spoiler, accordion, etc. from an external link would be an important added feature that would have huge implications for uses only limited by user creativity.
Imagine writing a few simple questions and answers in a blog post with a jump style index at the top.
Index link a href="#one"
Index link a href="#two"
Index link a href="#three"
[spoiler title='title' id='one']content[/spoiler]
[spoiler title='title' id='two']content[/spoiler]
[spoiler title='title' id='three']content[/spoiler]
This would be wonderful!