If you're referring to the text that you see in your windows, that's simply a matter of changing your font. Right click on the window name, then select Fonts, scroll through the fonts that are available. If you're looking for one that has italics, your best bet is to go with a True Type Font (TTF). This will change the font in the entire window.
If, on the other hand, what you're looking for is something that will do a temporary Italics , using something like CTRL + I, the same way that CTRL + B gives you Bold Then I'm in favour of this alteration.
Strike through, I can see being a lot harder to implement.
I don't understand what you mean about the Home/End function(s) though.