i don't really think it's necessary to have the "install program" option, but i'd definitely appreciate the "extract" options, especially if it supports those exe's that CAN be extracted (coz winrar would extract them). i know there are ways to sort of do that, but it's not entirely reliable (i've got an exe that can be extracted by winrar but not uniextract, the taught method in the forum somewhere - problem is i want my drive to be self sustainable, i.e. no need to rely on the host computer to have certain softwares or anything...everything runs off the portable drive). i don't know how hard it will be, or what the licensing issues there will be (coz presumably you'll use some libs from somewhere), but it'd be awesome if ketarin comes with that functionality. i'd even gladly donate some (just some...) money for that!
actually i'm more than happy to donate some money now but you don't have that on your website. maybe you can add a paypal link to your homepage in the meantime