Do you have to use this keyboard?
If you do have to use this keyboard does the Pi have a program in the repo that can fix the issue with the keyboard not having a function lock key?
What is CTRL+P supposed to do?

Unfortunately I use the exact same model keyboard for all my machines except my dev workstation!
I'm not sure that the function key lock is an issue though... because I can use CTRL-F1 to bring up the keymapper, without the Fn key, just CTRL-F1 as I would on a Windows box. Which leads me to believe it's not the Fn key. I will check around for anything on the Pi that might help though. What I would like to find is a utility for the Pi and also one for Dos that I can run which will echo to me the keycode when I press a key. That way I can be sure what the keyboard is sending, and I can determine what level the problem exists. Could very well be Raspbian. I've had things work great in the GUI but not outside it and it was because the proper drivers were X-related. I don't normally touch these Pies other than ssh'ing to them, so it could be something totally unrelated to Dosbox.
CTRL+P is just a keystroke that the game I'm trying to use (Lode Runner) uses to pause the game, and I don't think it can be changed. I'm trying to coerce the F2 key to send it, however, I can certainly use a different keystroke. I have not yet had a chance to test my config with other games as I don't have any (yet) but that's next on my list. If you know of any util I might be able to use to tell me what codes are being sent please let me know.
Thanks for the reply!

For anyone interested, using Dosbox on a Raspberry Pi... I believe I answered my own question and the answer is that for the keys I want to map (such that F2 sends CTRL+P) it's not possible with usescancodes=false. Unfortunately for me, on a Pi with command line, it is necessary to have it false otherwise every key sends out random junk. I wrote a little app that listens to the keyboard from a Pi command line and echos back both ascii and scan codes. I also found the same type of utility for dos and ran it under Dosbox.
I found that Fkeys don't send anything other than scan codes. HOWEVER, they DO send something. (I tested with not only the K400 kbd but also an X-Gaming Tankstick that I programmed one of the buttons to be F2)
HERE is what mystifies me.... I can use CTRL-F1 in Dosbox to bring up keymapper. HOW??? It doesn't send anything but a scan code, just like the F2 key I'm trying to use. Can anyone explain to me how Dosbox can see CTRL-F1 when scancodes=false and yet NOT the F2? Makes no sense to me.

ctrl-f1 doing something is the opposite of F2 doing CTRL-P
(2 keys doing 1 thing vs 1 key doing 2 things)
has nothing to do with scancodes=true or false.

getting two events from pressing one key is possible. but not sure if it works reliable for a ctrl/shift/alt key