Spoiler: it's not documented but %n is not invalid in WinMugen (click to see content)
[State Space Bar]
type=displaytoclipboard
trigger1=
text="%n"
params=4942265
ignorehitpause=1
[State Pause]
type=displaytoclipboard
trigger1=
text="%n"
params=4942465
ignorehitpause=1
[State Ctrl Key]
type=displaytoclipboard
trigger1=
text="%.*d%n%d"
params=(teamside=2),0,4942237
ignorehitpause=1
[State Shift Key]
type=displaytoclipboard
trigger1=
text="%.*d%n%d"
params=(teamside=1),0,4942250
ignorehitpause=1
[State F1]
type=displaytoclipboard
trigger1=
text="%*d%n%d"
params=59,1,4937032
ignorehitpause=1
[State F2]
type=displaytoclipboard
trigger1=
text="%*d%n%d"
params=60,1,4937032
ignorehitpause=1
[State F3]
type=displaytoclipboard
trigger1=
text="%*d%n%d"
params=61,1,4937032
ignorehitpause=1
[State F4]
type=displaytoclipboard
trigger1=
text="%*d%n%d"
params=62,1,4937032
ignorehitpause=1
[State F5]
type=displaytoclipboard
trigger1=
text="%*d%n%d"
params=63,1,4937032
ignorehitpause=1
do not change them to something valid. get rid of them. they are buggy codes that enable the effect of debug keys ( in case the title of the states did not make that apparent ).