//Occasionly, FinaleScript will select the wrong tool in the beginning of the script ("Measure Attributes" instead of "Time Signature").
//Nothing to do about that, just run the script once more.

message: "Make sure that you have set the time signature before creating the pickup measure."
select measure 1
menu item "Time Signature"
RETURN
button "Composite..."
expect to check "Use EDUs for Beat Duration"
type "1" near "Beat Groups"
type "1024" near "Beat Duration" //1024 EDUS = 1 quarter note
tab //The following lines empties all settings of composite time signatures.
press spacebar  
tab
press spacebar 
tab
press spacebar 
tab
press spacebar
tab
press spacebar  
tab
press spacebar 
tab
press spacebar 
tab
press spacebar 
RETURN
button "More Options"
expect to check "Use a Different Time Signature For Display"
shift tab 3  // Navigates to a radio button otherwise inaccessible to FS
press spacebar  // Presses a radio button to limit TS change to measure 1 only.
RETURN
menu item "Measure"
"Edit Measure Attributes..."
RETURN
uncheck "Include in Measure Numbering"
RETURN