Problem:
   Actually no problem but following through trying found out!


Solution:
   How would it be with a few keyboard-abbreviations (ShortCuts)?

   Fast enlargement:
      Right old-button and mouse-button simultaneously presses.

      The opinion-formats are 50 | 100 | 200 | 400%

   Fast reduction:
      Shift, rights old-button and mouse-button simultaneously presses.

      The opinion-formats are 200 | 100 | 50 | 25%

   Moves in the document:
      Right Amiga-Taste and mouse-button simultaneously presses.

      And now the mouse moves. Everything plainly?

Explanation:
   These functions are not described in the handbook.

   Do you know even further? With it... ; -)