Add parameter to the index entry

[Ehud Behar]

I want to insert a "people" index into my document so that an index 
entry has the
[people]
"parameter" appended to it. Like this:
\index[people]{Dirac, Paul} and \index[people]{Maxwell, James Clerk}

So I want to make some changes to the index entry that is defined in the 
stdinsets.inc file.

I tried to insert the following lines in my local layout but it gives me 
'\index{peopleDirac, Paul}' instead of '\index[people]{Dirac, Paul}':

InsetLayout Index
	LabelString           Idx
	Decoration            classic
	Font
	  Size                Small
	EndFont
	LabelFont
	  Color               indexlabel
	  Size                Small
	EndFont
	LatexParam people  #<<<<< New
	MultiPar              false
	CustomPars            false
	ForcePlain            true
	ContentAsLabel        true
	PassThruChars         @|!
End

Any idea how to achieve it?