Here is how I modified DokuWiki to allow me to use any mixture of uppercase and lowercase for page identifiers or titles.

--- fresh-dokuwiki/inc/HTTPClient.php   2006-03-09 14:32:34.000000000 -0600
+++ wiki/inc/HTTPClient.php     2006-03-18 12:35:04.000000000 -0600
@@ -351,11 +351,12 @@
     function _parseHeaders($string){
         $headers = array();
         $lines = explode("\n",$string);
         foreach($lines as $line){
             list($key,$val) = explode(':',$line,2);
-            $key = strtolower(trim($key));
+            //$key = strtolower(trim($key));
+            $key = trim($key);
             $val = trim($val);
             if(empty($val)) continue;
             if(isset($headers[$key])){
                 if(is_array($headers[$key])){
                     $headers[$key][] = $val;
diff -r -U 5 fresh-dokuwiki/inc/pageutils.php wiki/inc/pageutils.php
--- fresh-dokuwiki/inc/pageutils.php    2006-03-09 14:32:34.000000000 -0600
+++ wiki/inc/pageutils.php      2006-03-18 13:00:25.000000000 -0600
@@ -76,11 +76,11 @@
   $sepchar = $conf['sepchar'];
   if($sepcharpat == null) // build string only once to save clock cycles
     $sepcharpat = '#\\'.$sepchar.'+#';

   $id = trim($id);
-  $id = utf8_strtolower($id);
+  //$id = utf8_strtolower($id);

   //alternative namespace seperator
   $id = strtr($id,';',':');
   if($conf['useslash']){
     $id = strtr($id,'/',':');

Another approach would be to make it a config option. Then you can share out your code without imposing your way of doing it. ;)

The function act_clean in actions.php may present a problem. It does a lower case on the $act parameter. I haven't figured out what is affected by that.

--- dokuwiki.php    2006-11-11 18:02:32.000000000 -0800
+++ dokuwiki.php.case   2006-11-11 18:04:24.000000000 -0800
@@ -40,4 +40,5 @@
 $conf['maxseclevel'] = 3;                 //Up to which level create editable sections (max. 5)
 $conf['camelcase']   = 0;                 //Use CamelCase for linking? (I don't like it) 0|1
+$conf['uselower']    = 1;                 //Convert all titles to lowercase?  (Not if you like CamelCase) 0|1
 $conf['deaccent']    = 1;                 //deaccented chars in pagenames (1) or romanize (2) or keep (0)?
 $conf['useheading']  = 0;                 //use the first heading in a page as its name
--- pageutils.php   2006-11-11 17:58:21.458801031 -0800
+++ pageutils.php.case  2006-11-11 18:25:26.000000000 -0800
@@ -87,5 +87,7 @@

   $id = trim($raw_id);
-  $id = utf8_strtolower($id);
+  if($conf[$uselower]) {
+    $id = utf8_strtolower($id);
+  }

   //alternative namespace seperator
--- HTTPClient.php  2006-11-11 17:58:03.000000000 -0800
+++ HTTPClient.php.case 2006-11-11 18:25:10.000000000 -0800
@@ -373,5 +373,9 @@
         foreach($lines as $line){
             list($key,$val) = explode(':',$line,2);
-            $key = strtolower(trim($key));
+            if($conf[$uselower]) {
+                $key = strtolower(trim($key));
+            }else{
+                $key = trim($key);
+            }
             $val = trim($val);
             if(empty($val)) continue;