Bruno Le Floch writes:
 > Hello,
 > 
 > I'm not sure whether this is the right place to send a bug report on
 > l3tl. 

Hi Bruno

as good a place as any I guess. It probably gives you fast response. 
For functionality suggestions (like the later part of this thread this list is
certainly the right place).

An alternative would be to log a real bug in the ancient LaTeX bug database

http://www.latex-project.org/cgi-bin/ltxbugs2html?introduction=yes&state=open

under the topic "experimental kernel"

The advantage would be that it would be easier to track if it takes more time
to fix something

frank