Suggestion: Implement autofit width on table column display, so that double-clicking on rightmost part of each column header resizes+autofits it (& perhaps double-clicking again reverts it back) á la Excel.
Suggestion: Add tickbox to Query Builder for searching within local/cached database only ie not connecting to server. (Possible overkill option would be displaying yes/no dialog box after a (fruitless) local search query stating 'No results found. Run this query on example.userbugzilla.org?')
Suggestion: Double-clicking on a bug listed in query results brings up an 'Edit bug' dialog box. Prior to trying it, I thought it would bring up a *view* of the bug and its associated comments in a dialog box so that the user could move it around the screen, re-size it - perhaps to open two bugs simultaneously and stretch them to fill the screen vertically side-by side for comparison. A user can see the bug+comments in the lower-pane currently, opening each bug/query result in a Deskzilla window does seem appealing though. It'd probably need to be either a configurable option ('Open bug within dialog box in view mode or edit mode, when selected?'); or, 'view' could simply be added to the right-click context menu too.
Suggestion: Help documentation.
Suggestion: Evaluate adding in support for OpenID to see if it might be useful.
Suggestion/Issue?: On some bugs I viewed I found the comments didn't always wrap within the window, no horizontal scrollbar was present so to see the whole comment I needed to resize the right-hand window (query results+bug) by dragging it to the left, covering the node/products list. Resized as far as it could go allowed me to see 99% of the comment text (screen res 1024x768).
Suggestion: "Work Offline" mode, enable/disable via File menu.