[Vimperator] Addon search keywords

[Kipling Inscore]

It seems to me that Firefox has at least two search engine keyword
systems. One is accessible from the search bar, address bar and
Vimperator's (tab)open commands; the other is accessible only from the
address bar--this is the one that the del.icio.us and possibly other
addons use to add search engines (del.icio.us allows bookmarks to be
tagged as shortcuts and used in the address bar as such). I don't know
if this is a fault in Firefox (for providing pointless redundant
mechanisms) or the del.icio.us addon (for using a deprecated mechanism
or using the correct mechanism incorrectly) but it seems this can be
solved in Vimperator. The mechanism is there in Firefox, after all, so
if adding support doesn't make Vimperator's code unwieldy...
For Vimperator 0.5.3 I created crude patch using getShortcutOrURI()
(takes a keyword/search string or URI, returns a URI with
keyword/search expansion) but I'm not sure this will be the correct
method for Vimperator 1.x. I'll be working on a patch, particularly to
support del.icio.us bookmark shortcuts through the official
del.icio.us addon, so guidance on where I should be looking or whether
I should be doing this would be appreciated.