Hey,
thank you for your comment 
I actually did this with some of my LaTeX controls and using the Frontmatter-Feature.
In the Compile window I checked “Add Frontmatter” and seletected a file outside of the Documents Draft-Folder and compiled it “as is”. In there are included all the controls over if table of contents, list of figures and the custom title page, as well as the custom text sections for abstract, the copyright and non-disclosure parts.
The problem is that “as is” files doen’t get parsed properly from MMD -> LaTeX code from my experience.
Should it, though 
[code]+ List
- List
- List[/code]
Gets the following output:
With the according latex code in the tex file:
\begin{itemize}
\item List
\item List
\item List
\item List
\end{itemize}
While I really like the Frontmatter feature to include the latex-code that needs my interaction during writing and it spares me from fiddeling around with the preamble, it is still not the best solution for the content sections.
It differs from the usual scrivener workflow as an important part like the abstract is somewhere burried in latex code and crammed together with other sections, such as the copyright statement.
But it gets really messy for the end of my document, as everything is not only excluded from the scrivener document by the external “footer.tex” (meta: latex footer).
As right now I use several “/includes{…}” in the footer to link to external .tex files for a bibliography, glossary the appendix and custom chapters such as the “declaration of academic honesty”, as it is easier to toggle them on and off just in the footer for typesetting.
Besides all that:
It would be great to be able to access the content of a file inside the scrivener project and include it into another.
Why would I need to do this?
I got my LaTeX controls in the Frontmatter-document and if I exclude the abstract and other content sections (copyright, etc.) from that and put it inside of the Draft-Folder, the sequence in the documents would not be as desired:
It should be:
- Titlepage
- Abstract
- Copyright
- Table of Contents
- Table of Figures […]
But it would be more like:
- (Frontmatter “LaTeX Controls”)
[list][*]Titlepage
- Table of Contents
- Table of Figures […]
[/:m]
[](Draft-Folder of the actual Document)
- Abstract
- Copyright
[/*:m][/list:u]
If I could access and “include” the content of sections layed out inside of my Draft-Folder inside of the frontmatter, I could structure the Frontmatter as desired.
I am thinking of something like this:
[code]% Frontmatter: LaTeX Controls
[/code]
Furthermore:
There is a variable, called <$sectiontitle>, which – according to the documentation – should give back the last sectiontitle (scrivener-file title?) from the last section that had a pagebreak. But it doesn’t seem to work at all 
If I use <$sectiontitle> it just gets printed without parsing. In both, “as-is” and normally compiled files.
This would come in handy for the following:
<!--\section*{<$sectiontitle>}
\addcontentsline{toc}{section}{<$sectiontitle>}
\label{<$sectiontitle>}-->
Because then –besides having the snippet of commented latex-code inside the document – the title-handling wouldn’t differ from the usual ‘workflow’. 
Thanks in advance 