Hey there! Sorry for the late reply ...
domokun, I did not find the time to use more of SLX add-on files. What I can say is, the guide's set-up works quite fine with the latest version - you are right, though, it is highly recommended to use more of Solus' project. You could replace GL4 with SLX' SLX-optimized GL3 system, and much, much more. It's a terrific mod! Considering the limited time I have to spend on the forums and out of convenience as well as gaming experience so far, I will leave the guide's SLX set-up - for now. Thanks for your input
Banderas, fleeing is mostly GL4's domain, you can set up the enemy team's morale values in the GL4 configs. I do not have any particular or preferred values at hand. Wounding is best applied by using either ArmA2's vanilla modules or ACE2's wounding system. Taking captives is SLX' domain, of course, and can severely interfere with "standard vanilla" gameplay. I guess it's up to you to what degree you'd like to introduce the feature into your gaming experience. As for the guide the surrendering is limited; should you decide to use SLX' additional wounded features, only incapacitated enemies will surrender to you after they have been healed.
sampat1, welcome to the game! Right, as Banderas says, you can open the userprofile (the file called "yourplayername.ArmA2Profile") with any text editor such as Window's "NotePad".
rangoon, the mods work in single player - but get ready for an intense and possibly frustrating battle experience. With more aggressive enemies engaging at medium to long ranges and revamped armour values, the single player difficulty balance is severely disrupted. Personally, I did enjoy the challenge as you often find yourself developing alternative strategies to reach your goal - some of the missions take 3 to 5 times the time they would take in "vanilla mode". If nothing else helps or you face a "dead end", just lower the difficulty settings (enemy aiming / precision above all) in your user config. I admit I did that several times to get past a really nasty area - then set the values back to normal again.
You can very easily turn off mods as you like. Just, as you said, remove the pertaining "@-" folder from your shortcut "-mod=" starting parameter.
Again, sorry for the late reply - and thanks for your input here!