I'm not sure if the surveyor is the right place to ask, but I would like, please, an "IF - ELSE - THEN" stuf in the session edit menu.
I use an IF .. ELSE .. THEN equivalent all the time in Session Rules using variables. See the first example on the Trainz Wiki page at https://online.ts2009.com/mediaWiki/index.php/How_to_Use_Variables_in_Sessions_(Examples)