I tried to edit the XML, however, the file located under your C:\Users\Documents\Egosoft\X4\33051955 section still does not allow those desired keybinds. With the help of steam users **Huillam** and **Koschei_D**, I was able to use a program called AutoHotkey to help address these items. *
The goal is these changes was to make it so LCTRL could be used a down strafe, LALT could be used as a modifier key for thrusters to make docking easier and have LALT+F have me get out of my chair, change LSHIFT to boost, and ultimately remap the F1-F12 keys to more closely mimic Mobiglass type keybinds. If anyone tries this out and has any suggestions, I'd be happy to include those here and make sure credit is provided

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Below I have listed out the steps I took to mimic the SC Advanced Controls. I posted the resources available under a Google Drive and listed necessary links below:
1) Download Autohotkey - https://www.autohotkey.com/download/
- I went ahead and pinned to my taskbar so scripts would be easier to access
- Place this file wherever you can easily locate on your PC. I went ahead and placed it in C:\Users\Documents\Egosoft\X4\33051955 to keep all these items in one place.
- You MUST place this in your C:\Users\Documents\Egosoft\X4\33051955 folder. Please be sure to make a copy of your custom control scheme if you've created one. Or rename then end part of the inputmap_1.xml file to inputmap_2.xml or inputmap_3.xml
- Step 1: Launch the X4Frontiers_v2.ahk file
- Step 2: Launch X4: Frontiers on Steam
- Step 3: Under your Settings -> Controls section, load the profile titled 'Star Citizen' (Complete Once)
- Step 4: Under Game Settings turn off Aim Assist and Auto Roll (Optional, but super annoying)
- Step 5: Load your game and enjoy
The main issue I have is that after LCTRL-TAB to desktop (originall ALT-TAB), no keys work due to a sticky key situation and I must press EACH key at least once that have been remapped (LALT, LCTRL, RALT, SHIFT). If anyone knows how to adjust AutoHotkey to avoid this, I'd love to fix this and make it easier for people looking to get a better Star Citizen control experience in other space games.
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Script Details:
IfWinActive ahk_exe X4.exe
LAlt::LCtrl
LCtrl::LAlt
RALT::SHIFT
SHIFT::RALT
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*Disclaimer: This may not work well for everyone. Also, because keys like LCTRL, LSHIFT, LALT, and RALT have been remapped, it can be a little confusing to use at first if you're doing more than just playing X4. When you do ALT-TAB, go ahead and press all buttons or else the first line of the script won't disable the script on your normal desktop. Once you do, all keys should restore to normal functionality until you re-open the game. Again, if anyone knows some scripting tricks to restore some normal control after ALT-TAB, please let me know!
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TL:DR; I got X4 to have a similar control-scheme as Star Citizen Advanced Flight Controls.