If you want to scroll the CMD window while a batch file is running, you can alter the Windows width (characters) and depth (screen buffer lines) by issuing a mode command in the batch file:
mode con\[:\] \[cols=c\] \[lines=n\]
con\[:\] indicates the change is to be made to the current command prompt window. cols=c specifies the width, c, in characters. lines=n specifies the number of lines, n, in the screen buffer.