Index: class.c
==================================================================
--- class.c
+++ class.c
@@ -2174,11 +2174,11 @@
 static void parse_order_block(void) {
   // OP_MISC1, OP_MISC1_C, etc = properties (_C=reverse)
   // 0x1000...0x10FF = Have flag
   // OP_RET = end of block
   Uint16 beg,ptr;
-  ParseError("(Not implemented yet)\n"); //TODO: remove this when it is implemented properly in exec.c too
+  if(!main_options['U']) ParseError("(Not implemented yet)\n"); //TODO: remove this when it is implemented properly in exec.c too
   orders=malloc(0x4000*sizeof(Uint16));
   if(!orders) fatal("Allocation failed\n");
   nxttok();
   if(tokent==TF_INT) {
     if(tokenv<1 || tokenv>254) ParseError("Order number out of range\n");

Index: commandline.doc
==================================================================
--- commandline.doc
+++ commandline.doc
@@ -23,10 +23,15 @@
 
 -T
   Mode for testing some internal functions of Free Hero Mesh and SDL. You
   probably do not need to use this mode yourself.
 
+-U
+  Enable unstable/experimental features. These features may change in
+  future and may later be made not needing this switch; but for now you
+  should not use them except for testing and development of Free Hero Mesh.
+
 -a
   Autotest levels, ensuring that the provided solution is valid. Lines
   that don't match /^Level [0-9]+\.*: OK$/ denote errors.
 
 -c

Index: man6/heromesh.6
==================================================================
--- man6/heromesh.6
+++ man6/heromesh.6
@@ -19,10 +19,12 @@
 Dump all class data.
 .IP -H
 Dump the hash table.
 .IP -L
 Display all tokens being read from the class definition file.
+.IP -U
+Enable experimental/unstable features.
 .IP -a
 Autotest levels, ensuring that the provided solution is valid.
 .IP -c
 Only load classes and then terminate.
 This can be used to verify that the class definition file does not contain syntax errors.