REBOOTOK is useful but dangerous
If you say RmDir /r /REBOOTOK $INSTDIR, the whole installation directory with its contents will be removed. The flag REBOOTOK will enable removing the directory after rebooting.
This is very useful, but this function is dangerous due to the activated radio button "immediately reboot Windows" by default. It is much better, if the radio button "reboot later by yourself" is activated by default.
How can I do that?