Dell Latitude E6530 keymap

I have a Dell Latitude E6530 laptop
(system vendor "Dell Inc.", product name "Latitude E6530"). A few of the keys are mapped incorrectly:

Fn+F5, Touchpad Toggle
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Fn+F5 is labeled on my keyboard with a "touchpad" icon, and in udev 198, the line in /lib/udev/keymaps/dell for it is this:

0x9E f21 #touchpad toggle

Since we know it is "touchpad toggle" (and I confirm it is), and there is a key name for that, how about changing this line to read thusly:

0x9E touchpad_toggle # Fn+F5

In the same "dell" file, 0xD9 is mapped the same ("f21 # touchpad toggle"); perhaps it also should be changed to send a real touchpad_toggle?

Fn+F8, LCD/CRT Switch
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Fn+F8 is labeled on my keyboard with an "LCD/CRT" icon. It sends two keycodes: Left_Win (aka "leftmeta"), then "p". Can we get it to appear as a single "switchvideomode" key? (If this is outside udev's domain, where should I look?)

Fn+End, Prnt Scrn
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The SysRq (Fn+Home) and Prnt Scrn (Fn+End) keys both send the same scan code, 0xB7, which is mapped to "sysrq". How can I get Prnt Scrn to send something unique?

< Stephen

Unfortunately X can't deal with keycodes above 255 :(

Dmitry