/* I don't need any real credit for this. It's pretty global,
 * and there's all kinds of functions with this code in it. 
 * I'm only putting this up here because I can't seem to connect 
 *to www.mudmagic.com and stock ROM doesn't have remove all...
 * --Koqlb
 */

In act_obj.c find the following code:

    if (arg[0] == '\0')
    {
        return;
    }

And add the code with the + signs below it, and above the bottom code:
Make sure to remove the + signs... I've forgotten before... MESS!
/* Remove all - Global snippet. */
+    if (!str_cmp (arg, "all"))
+    {
+        OBJ_DATA *obj_next;
+
+	for (obj = ch->carrying; obj; obj = obj_next)
+        {
+            obj_next = obj->next_content;
+	if (obj->wear_loc != WEAR_NONE && can_see_obj (ch, obj))
+	remove_obj (ch, obj->wear_loc, TRUE);
+        }
+        return;
+    }
+    else
+
        if ((obj = get_obj_wear (ch, arg)) == NULL)
    {
        send_to_char ("You do not have that item.\n\r", ch);
        return;
    }