These are VESA standard timings information in EDID. The decoder ring for the 18 bytes is as follows:

1. Low Byte of DClk in 10 KHz
2. High Byte of DClk in 10 KHz
3. Horizontal Active in pixels, LSB
4. Horizontal Blanking in pixels, LSB
5 Bit 7-4: Upper 4 bits of Hor. Active
5 Bit 3-0: Upper 4 bits of Hor. Blanking
6. Vertical Active in lines, LSB
7.Vertical Blanking in lines, LSB
8 Bit 7-4: Upper 4 bits of Vert. Active
8 Bit 3-0: Upper 4 bits of Vert. Blanking
9. HSync Offset from Hor. Blanking in pix., LSB
10. HSync Pulse Width in pixels, LSB
11Bit 7-4: Lower 4 bits of VSync Offset
11 Bit 3-0: Lower 4 bits of VSync Pulse Width
12 Bit 7-6: Upper 2 bits of HSync Offset
12 Bit 5-4: Upper 2 bits of HSync Pulse Width
12 Bit 3-2: Upper 2 bits of VSync Offset
12 Bit 1-0: Upper 2 bits of VSync Pulse Width
13. Horizontal Image Size, LSB
14. Vertical Image Size, LSB
15Bit 7-4: Upper 4 bits of Hor. Image Size
15 Bit 3-0: Upper 4 bits of Vert. Image Size
16. Horizontal Border in pixels
17. Vertical Border in lines
18. Flags:
Bit 7: 0 = Non-interlaced, 1 = Interlaced
Bit 6-5: 00 = Reserved
Bit 4-3: 11 = Digital Separate
Bit 2: Vertical Polarity (0 = Negative, 1 = Positive)
Bit 1: Horizontal Polarity (0 = Negative, 1 = Positive)
Bit 0: 0 = Reserved"

Not sure on the byte flags on the end. Probably makes sense to do exactly as you did: copy from the other four.

Not sure why that DTD isn't showing up for you. One thing I've noticed is that your Horizontal image size is 519 and Vertical is 324. Was that on purpose? I notice that the other DTDs leave this completely blank anyway, so not sure if we're confusing the driver with Too Much Information. Here's my decode of what your DTD says:

3C28 = 154.00 MHz pixel clock

780 = 1920 Horiz Active
A0 = 160 Horiz Blank

4B0 = 1200 Vert Active
23 = 35 Vert Blank

030 = 48 Hsync offset from blank
020 = 32 Hsync pulse width

03 = 3 Vsync offset
06 = 6 Vsync pulse width

207 = 519 Horiz image size
144 = 324 Vert Image size

00 Horiz border
00 vert border

progressive, 0011, negative polarity vert, positive polarity horiz, 0

19: 27, 20: 00

What did you have to do to test these values? Did you have to reinstall the driver and reboot? Or is there a faster method?

Does the driver only use DTD_1 through 5 or can it support more entries? It'd be a little easier to try a bunch in bulk by putting them all in the INF first. The reboot/reinstall dance gets a bit time consuming...

And is there any documentation on the other values set in the driver?

In my setup I'd like to use Clone mode with a 1920x1080 desktop. I'd like the VGA output to 'pad' this along the top/bottom to have it use native pixel resolution on a 1920x1200 display. Then use the 1920x1080 resolution out the HDMI port on a Prolink ADD2 card but adjust the overscan to lose a few less pixels than it does currently. That and the HDMI output refresh needs to be 59mhz, otherwise there's a bit of noise along the left edge of the display.

I suspect this is possible using the current drivers with appropriate tweaks to the INF. The hassle is determining just what can or can't be tweaked, and how.