These are kown bugs and limititation.

Bugs:
o if a comment is protected in a configuration file, LUCI still see it as
  a comment. For example, this line is not read correctly by LUCI:
  PRAMETER="aa # bb"
o some errors in the description file are not detected and crash LUCI.

Limitations:
o config files cannot contains entries with the same name, (like nameserver in
  /etc/resolv.conf)
o LUCI cannot edit sections oriented config files (like /etc/wine.conf)
o comments cannot be in two parts (like /* */ in C). 
