I do not know of a built in method.

My solution has been to use a javascript (credit to Dave Saunders for the script) and apply a KB shortcut to it to make life simpler.

// JavaScript Document
//DESCRIPTION: Resets active window size or uses front window to set default size.
 
// Check for WindowDefault.txt; if present use it to set front window
// if not, use front window to set it after checking with user.
 
myPath = app.activeScript;
myParts = myPath.toString().split("/");
myParts[(myParts.length - 1)] = "WindowDefault.txt";
myNewPath = myParts.join("/");
 
mySettingsFile = File(myNewPath);
 
// Before proceeding, check that there is a front window
// If not, offer user the chance to delete the current settings
if (app.windows.length < 1) {
 if (confirm("No window is open; would you like to delete the settings file?")) {
  // User said yes; check that it exists
  if(mySettingsFile.exists) {
   mySettingsFile.remove();
  }
 }
} else {
 
if (mySettingsFile.open("r")) {
 
savedBounds = mySettingsFile.read();
  mySettingsFile.close();
 
myBounds = savedBounds.split(",");
  for (i = 0; i<myBounds.length; i++) {
   myBounds[i] = Number(myBounds[i]);
  }
  app.windows[0].bounds = myBounds;
 } else {
  if (confirm("Settings file is missing. Use current front window to set default?")) {
   // User said: go to it.
   new File(mySettingsFile);
   mySettingsFile.open("w");
   mySettingsFile.write(app.windows[0].bounds);
   mySettingsFile.close();
  }
 }
}

open a document and position it how you want it to fill the screen (or not).

Run the script. (it then saves the position)

after that, whenever you open any document, run the script to quickly reposition it to the desired location.

NOTE: this does NOT function with the tabbed panels, you will need your documents to be floating. Worked with CS2 and CS4 (and I assume CS3, though I never had that version).

Thank You!

I tried the script and it works great for me. Saves a lot of time!