actually, the readme says why the memory leak doesn't exist.

Parameters: [index,]icon
Description: This adds an icon to the image list. You HAVE TO add an icon to the image list before you can add it to the statusbar. I had to add this to stop the memory leaks. It returns how many icons are currently in the image list.
Examples: /dll ktools.dll SbAddIcon icon.ico
/dll ktools.dll SbAddIcon 4,mirc.exe

deep down, i'm really superficial.