HC maintains in global variables certain information from which it derives some default behaviours. It is possible to access or create these variables and alter these defaults. They are very poorly documented, so it may well be that there are others I have not been able to discover yet.
documents, applications, stacks -- set initially in the Startup handler of the Home stack, using bg fld "Paths" the cards with same names. These determine the "search paths" whereby HC will look for documents, applications, and stacks if they are not in the same folder as HC or the same folder as the current stack. You can reset the globals yourself, and you must set them in the startup handler of a standalone if you want it to have such "search paths".
scriptFindString, scriptWholeWord, scriptCaseSens, scriptWrapAround -- these determine initial settings in the Find dialog of the script editor (and are subsequently changed when you change those settings). You can set them yourself (eg in a startup handler) if you don't like those settings and don't want to be bothered changing them manually the first time the dialog appears.
scriptWindowRects -- each line is a Rect corresponding to the rect of each successive simultaneous open script window.
