Omit language preVar for RealURL 2.x with multidomain-multilanguage setup? - typo3-6.2.x

Question

In a TYPO3 6.2.30 site, I updated RealURL 1.x to 2.2.1.
It works fine, but it is a multilanguage-multidomain site that doesn't require the language prefix after the domain.
Before I had
www.germandomain.ch/seite
www.frenchdomain.ch/page
Now I get
www.germandomain.ch/de/seite
www.frenchdomain.ch/fr/page
The old paths are still working as an alternative though.
How can I omit the parameter from the URL for both languages - is that still possible with RealURL 2?
Below are the relevant configuration snippets. I don't have domain records defined in the backend / pagetree.
'preVars' => array(
array(
'GETvar' => 'L',
'valueMap' => array(
'de' => '0',
'fr' => '1',
),
//'valueDefault' => 'de',
'noMatch' => 'bypass',
),
array(
'GETvar' => 'no_cache',
'valueMap' => array(
'no_cache' => 1,
),
'noMatch' => 'bypass',
),
),
and
$TYPO3_CONF_VARS['EXTCONF']['realurl']['_DOMAINS'] = array(
'encode' => array(
array(
'GETvar' => 'L',
'value' => '',
'ifDifferentToCurrent' => true,
'useConfiguration' => '_DEFAULT',
'urlPrepend' => 'https://www.germandomain.ch',
),
array(
'GETvar' => 'L',
'value' => '0',
'ifDifferentToCurrent' => true,
'useConfiguration' => '_DEFAULT',
'urlPrepend' => 'https://www.germandomain.ch',
),
array(
'GETvar' => 'L',
'value' => '1',
'ifDifferentToCurrent' => true,
'useConfiguration' => '_DEFAULT',
'urlPrepend' => 'https://www.frenchdomain.ch',
),
),
'decode' => array(
'www.germandomain.ch' => array(
'GETvars' => array(
'L' => '0',
),
'useConfiguration' => '_DEFAULT',
),
'www.frenchdomain.ch' => array(
'GETvars' => array(
'L' => '1',
),
'useConfiguration' => '_DEFAULT',
),
),
);
and in TS
config {
sys_language_uid = 0
linkVars = L
language = de
locale_all = de_DE.utf-8
htmlTag_langKey = de
#defaultGetVars.L = 0
}
[globalVar = GP:L = 1]
config {
sys_language_uid = 1
language = fr
locale_all = fr_FR.utf-8
htmlTag_langKey = fr
#defaultGetVars.L = 1
}
[global]