While it may seem useful to have this kind of generic struct, it would
cause issues if the generic struct wouldn't be enough in future anymore.
Changing the DNA struct typw would be hard to do versioning for.

@@ -347,0 +345,4 @@
+    DEPRECATED. Use `script_paths_pref` which supports multiple script paths now. Returns the
+    first valid of these script paths for now, for compatibility.
+    """
+    # TODO how to handle deprecation of this?

@@ -347,0 +351,4 @@
+
+
+def script_paths_pref():
+    """returns the user preference script directory paths or None"""

@@ -347,0 +354,4 @@
+    """returns the user preference script directory paths or None"""
+    paths = []
+    for script_directory in _preferences.filepaths.script_directories:
+        if script_directory.directory:

@@ -1142,0 +1170,4 @@
+        new_dir.directory = self.directory
+        new_dir.name = os.path.basename(self.directory.rstrip(os.sep))
+
+        assert(context.preferences.is_dirty == True)

@@ -1142,0 +1197,4 @@
+                script_directories.remove(script_directory)
+                break
+
+        assert(context.preferences.is_dirty == True)

@@ -668,0 +671,4 @@
+typedef struct NamedDirectoryPathEntry {
+  struct NamedDirectoryPathEntry *next, *prev;
+
+  char name[64];      /* MAX_NAME */

@@ -344,6 +345,45 @@ static void rna_userdef_script_autoexec_update(Main *UNUSED(bmain),
   USERDEF_TAG_DIRTY;
 }
 
+static void rna_userdef_script_directory_name_set(PointerRNA *ptr, const char *value)

@@ -347,0 +345,4 @@
+    DEPRECATED. Use `script_paths_pref` which supports multiple script paths now. Returns the
+    first valid of these script paths for now, for compatibility.
+    """
+    # TODO how to handle deprecation of this?

@@ -668,0 +671,4 @@
+typedef struct NamedDirectoryPathEntry {
+  struct NamedDirectoryPathEntry *next, *prev;
+
+  char name[64];      /* MAX_NAME */

@@ -344,3 +344,1 @@
-    """returns the user preference or None"""
-    path = _preferences.filepaths.script_directory
-    return _os.path.normpath(path) if path else None
+    """

@@ -800,1 +802,4 @@
 
+  if (!USER_VERSION_ATLEAST(306, 5)) {
+    if (userdef->pythondir_legacy[0]) {
+      bUserScriptDirectory *script_dir = MEM_callocN(sizeof(*script_dir),

@@ -347,0 +355,4 @@
+  }
+  if (STREQ(value, "DEFAULT")) {
+    BKE_report(
+        NULL, RPT_WARNING, "Name 'DEFAULT' is reserved for internal use and cannot be used");

@@ -800,1 +802,4 @@
 
+  if (!USER_VERSION_ATLEAST(306, 5)) {
+    if (userdef->pythondir_legacy[0]) {
+      bUserScriptDirectory *script_dir = MEM_callocN(sizeof(*script_dir),