Maybe make sure you're running the latest version of Alaska Revisited? The build i'm on is 3.0.3 which I think is the final build. Here's how I go about adding a custom home item anyway, it's broken down into the basic details, so ignore if it's too simple of a guide, I took the screenshots and decided to just use them all
;
This is my gaming icon
Done by going to Settings;
Then within settings, go to Alaska;
These are the options I have, so I just go down to custom items and add from there (they add within a specific order, slotting between the default icons, so if you want it to be somewhere specific, you have to add it that way...like me using Custom Item 2 puts it between Videos and Music);
And then i'm using Advanced Launcher to launch my games, so it's just setup the same way sub menu items are;
If you dont have those options, then all I can think of is that you're not running the latest version of Alaska Revisited, if it's not available from the repo, you may need to ask Hitcher for an updated link (since it looks like the direct dropbox link from the other thread is broken again for 3.0.3).