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I finally got my mods to a point where I'm comfortable with others testing. I've only been using it with XPlane seen as it is so dang cold and snowy outside. You need to define OSD_PORT and OSD_MODE_CHANNEL. OSD_MODE_CHANNEL will allow you to assign a toggle switch to turn on and off the OSD overlay while in the air.

Some of the features included:

• Auto-home saving from init_home()
• Distance and direction to home
• Artificial horizon
• GPS LAT & LONG
• Control mode and next waypoint + distance (working on relaying takeoff, land, etc messages)
• Overlay on/off via Tx switch

Here are the Remzibi Mods:
+----------------+
|  APM_Config.h  |
+----------------+
#define OSD_PROTOCOL        OSD_PROTOCOL_REMZIBI
#define OSD_PORT            3
#define OSD_MODE_CHANNEL    7

+---------------------+
|  ArduPilotMega.pde  |
+---------------------+
Medium loop, case 3:
#if OSD_PROTOCOL != OSD_PROTOCOL_NONE
        print_osd_ahrs();
#endif

Slow loop, case 1:
// Output OSD Data slow loop
#if OSD_PROTOCOL != OSD_PROTOCOL_NONE
        print_osd_data();                       
#endif

// Read OSD Mode Switch
#if OSD_PROTOCOL == OSD_PROTOCOL_REMZIBI
        read_osd_switch();
#endif

+---------------+
|   defines.h   |
+---------------+
After GPS type defines:
// OSD type codes
#define OSD_PROTOCOL_NONE       -1
#define OSD_PROTOCOL_REMZIBI     0

+----------------+
|  commands.pde  |
+----------------+
After line 251, bottom of init_home():
// Save Home to OSD
// ----------------
#if OSD_PROTOCOL == OSD_PROTOCOL_REMZIBI       
        osd_init_home();
#endif

And finally add the following file into your APM folder:

OSD_Remzibi.pde <-Version 1

OSD_Remzibi.pde <-Version 2

And for my Remzibi layout:

APM.bin