Hi Michal - I've never used tocloft, but it sounds sensible to me.

Do you mind contributing the work to TUG, i.e., copyright TUG instead of you personally? Not that it's a big deal either way.

Thanks,
Karl

Texlive 2014

This MWE does not generate a table of contents in the HTML file generated by htlatex

\documentclass{article}
\usepackage{tocloft} %comment this to see toc
\begin{document}
\tableofcontents
\section{sec1}
some text 1
\section{sec2}
some text 2
\end{document}

if tocloft is not used, then toc will show up in html.

command to compile is

htlatex foo.tex

Then view the file foo.html in same folder to see the missing toc.

Please see

http://tex.stackexchange.com/questions/190991/why-adding-tocloft-package-causes-tex4ht-not-to-generate-a-table-of-contents