The only way I can think of to solve someway your problem is the use of "log files", a not well known feature of notepad.
If you put at the very beginning of your text file the row ".LOG" (uppercase and with the initial dot) the system will append date and time to the document when opening it, and the cursor will be at the end of the document.
Both of those characteristics can be useful for you. A disadvantage is that in this way the system prompts you to save the document when exiting from it.
Tested in Win98 & Win2K.