Adding post-install radio option to do nothing when installer has finished - inno-setup

Question

Some time back I had this question. Some of that code is repeated here:
procedure RebuildRunList;
var
RunEntries: array of TRunEntry;
I: Integer;
begin
{ Save run list ... }
SetArrayLength(RunEntries, WizardForm.RunList.Items.Count);
for I := 0 to WizardForm.RunList.Items.Count - 1 do
begin
RunEntries[I].Caption := WizardForm.RunList.ItemCaption[I];
RunEntries[I].Checked := WizardForm.RunList.Checked[I];
RunEntries[I].Object := WizardForm.RunList.ItemObject[I];
end;
{ ... clear it ... }
WizardForm.RunList.Items.Clear;
{ ... and re-create }
for I := 0 to GetArrayLength(RunEntries) - 1 do
begin
{ the first two entries are radio buttons }
if (I = 0) or (I = 1) then
begin
WizardForm.RunList.AddRadioButton(
RunEntries[I].Caption, '', 0, RunEntries[I].Checked, True, RunEntries[I].Object);
end
else
begin
WizardForm.RunList.AddCheckBox(
RunEntries[I].Caption, '', 0, RunEntries[I].Checked, True, True, True,
RunEntries[I].Object);
end;
end;
end;
procedure CurPageChanged(CurPageID: Integer);
begin
if CurPageID = wpFinished then
begin
{ Only now is the RunList populated. }
{ Two entries are on 64-bit systems only. }
if IsWin64 then RebuildRunList;
end;
end;
I would like to know how I can make a enhancement to the radio choices. The drawback at the moment is that the user is forced to start one or the other application. I would like to add another radio option for simply closing down the installer. Ideally it would use a Inno Setup supplied message so that I do not have to ask for translations. (See this question).
Can this be done?

Answer 1

The easiest solution is to add a no-op entry to the RunList:
[Run]
...
Filename: "{cmd}"; Parameters: "/C exit"; Description: "Exit setup"; \
Flags: nowait postinstall runasoriginaluser unchecked skipifsilent runhidden; \
Check: IsWin64
And turn it to a radio button:
{ the first three entries are radio buttons }
if (I = 0) or (I = 1) or (I = 2) then