Since the result list can contain any number of types of items (url, contact, etc) who don't have modification times, I'm assuming you want that sorting only applied when in file browsing mode. I still have to add grouping and other features to the results list.
No, I think alphabetical order with directories grouped first remains best for file browsing mode. I was thinking of files returned during regular searches. For example, someone might search for "report" and get many matches. Chances are they're looking for the most recently modified file. For urls, it is probably the most recently visited one that they want. If the history has been cleared, you could order bookmarks/favorites by their creation date. However, contacts should probably be grouped together and sorted alphabetically (although I'm not an Outlook user, so that does not affect me).
Shortcuts and hotkeys are something that I need to apply a lot of thought to in how I want to implment them. They don't fit in "neatly" in a generic sense, so I'm trying to think of the best and most useful way to implement them.
Shortcuts are good, but you could do more with them. I would like to be able to define a shortcut to enter file browsing mode at a particular directory. For example, "kb" to start browsing at the root of my personal knowledge base, or "ks" to do a non-cached search from there. I also mentioned the idea of using a shortcut, say "hist", to do a non-cached url history search. Similarly, you could define shortcuts to limit the search results to a particular category of results (say "cont" for contacts) or to a particular file extension (say "ppt" for PowerPoint files).
On the other hand, I don't think you should try to do hotkeys at all (other than the main hotkey to show the search dialog). There are other products that do that job very well. I use AutoHotKey.
Do you think it will be more useful to not apply the filters to directory names?
Yes. I am not using filters at all.
And I'm not quite following HotKey to 0 issue. Can you elaborate?
My Guillotine.xml file says
HotKeyModifier="4" ... HotKey="0"
so the Guillotine search dialog pops up when I just press and release the Shift key, but nothing happens when I use the shift key in combination with another key, for example to type a capital letter. It is quicker to press and release a single key, than to press a key combination (like Control-Space) and there is very little risk of needing the hotkey to mean something else in a different application. However, this trick does not work with the Win key, because of the way you are registering your hotkey, but one can work around that with AutoHotKey.
Any other bugs or requests before I put out a build this weekend?
A minor one that you might want to consider. Windows always hides the .lnk extension on shortcuts. You may want to consider doing so as well to avoid confusing novice users.