While the actual settings will change when you load a graphic preset, the in game menu [options->graphics/adv graphics/troubleshoot] will not reflect that. If you want to save a preset after you have used the load function, go to [options->graphics->overall graphics quality] and click on any option (or restart LotRO) to refresh the in game options menu.
[Pause / Break] Because it is one of the keys that is not assigned by default.
Screen Mode: Full Screen (Windowed) or Windowed
Either just use the LotRO_Buddy.exe
_In case you do not trust exe files you can check the file on Virustotal_
or
Download and install AutoHotkey
Download classMemory.ahk and put it in the same folder as LotRO_Buddy.ahk
Everything in Graphics, Adv Graphics and Troubleshoot.