Best setup for install / portable version?

I am currently about packing software and wanted to make a bridge between the needs of a installed version and a portable version. Just wanted to deploy a single package. An installer where you can chose

a) install:
- desktop short cut (if selected, selected by default)
- start menu entry (if selected, selected by default)
- quick launch icon (if selected)
- register in windows software remove menu
- autostart (if selected, selected by default)
- all data goes to $appdata (documents and settings folder)

b) portable:
- just unpack, no install
- all data goes to $programmfolder/Data

Additionally I would maybe like to use the .paf format for the portable version by default.

What about using the .paf format for the installed version also? With the only difference that the app/data folder would contain only a text file where stands that all data is inside $appdata (documents and settings folder).

What you suggest?