I've been using Theo's search plugin for the Lazarus IDE for a few weeks now, and would like to urge that it be added to future releases of the IDE. It's a great tool.
And a suggestion: since there is room on the search bar, how about adding buttons for code tools ctrl shift up, ctrl shift down and ctrl shift i functions? These are also search functions (go to procedure definition, etc..) and it would be handy to have them there with the general search function.