The OSC dictionary is sometimes difficult to search. Finding the OSC to set the minimum go time will only work with goitime as your text in the find box. go time will give 0 result, as will minimum go.
tell application "System Events" to tell (first application process whose bundle identifier is "com.figure53.QLab.5")
tell application "QLab" to activate
keystroke "," using command down
select row 5 of table 1 of scroll area 1 of window 1
click button 1 of window 1 -- cue templates
select row 8 of outline 1 of scroll area 1 of splitter group 1 of window 1
click button 3 of group 1 of splitter group 1 of window 1
-- the menu popup
tell pop up button 2 of group 1 of splitter group 1 of window 1
click
delay 0.1
click menu item 3 of menu 1
end tell
-- then Value of Intensity
tell text field 2 of group 1 of splitter group 1 of window 1
set focused to true
delay 0.1
set value to 1.1 as text
end tell
tell application "System Events" to keystroke (key code 36)
click button "Done" of window 1
end tell