altering default hotkeys for document (pdf) viewer

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http://crunchbang.org – I want a stable PDF reader that has vim-like hotkeys and have tried several different ones. Zathura was probably the best of the lot, however, it crashes often, and so it is not long before I find myself opening large pdf files in document viewer once more.I wonder if there is any way to alter and add hotkey to the document viewer app. I read a post on askubuntu about how to do this thru gconf-editor, which I downloaded, but it seems geared toward the gnome desktop and document viewer is not listed as a recognized app by the gconf-editor (on my system), although it is definitely installed.So I (HowTos)