This will set mode R if someone, including server, removes it
and it will check for mode R when you join the channel and
set it if it's not already set.
on me:*:JOIN:#channel:.timer 1 1 checkmode #channel
on !*:MODE:#channel:.timer 1 1 checkmode #channel
on *:SERVERMODE:#channel:.timer 1 1 checkmode #channel
alias checkmode if (R !isincs $gettok($chan($1).mode,1,32)) mode $1 +R
#channel == your own channel name of course