mod_rewrite: trailing slash

Hello listies,

I have a directory and subdirectory under docroot, with the
following .htaccess files:


## DOCROOT/myfolder/.htaccess:
<IfModule mod_rewrite.c>
RewriteEngine on
RewriteRule ^$ webroot/ [L]
RewriteRule (.*) webroot/$1 [L]
</IfModule>

## DOCROOT/myfolder/webroot/.htaccess:
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ index.php?url=$1 [QSA,L]
</IfModule>


Requests to http://server/myfolder/ work fine,
Requests to http://server/myfolder (No trailing slash) DO NOT.

I've tried variations with rewritebase and rules like:
RewriteRule ^$ /myfolder/ [R,L]

To no avail. Any help?