I've added support for HOME and END now which will help non VI
thanks for fixing this.
I don't know if you've got any more time before the freeze, but there is one more issue. For check box lists it seems to be standard practice to select the focussed item, rather than leave it unselected. The downside of the current version for users of screen readers is that the screen reader reads the item as being unselected. In the present context, the user would think that the plug-in needed to be selected to be installed, and therefore would press spacebar - with the opposite result.