I am pretty sure there is no point in adding auto roll for roulette.
I can give you two:
1) It's an often requested feature, people ask about it a lot, and while not all users might want/need it, some certainly would appreciate it being added.
2) Roulette has the highest house edge (among the games offered at CG) and you would want to encourage people playing it, from an investor and administrator perspective.
Whatever odds you are going for, you might as well configure your dice wagering and percentage and its kind of like dice.
But you cannot win the roulette jackpot on dice, which is something you can't configure or "kind of" simulate using dice. It's exclusive to those users playing roulette.
There is a way to do it, although it lacks a stop on win that would be useful when chasing a single number.
~snip script~
It's a workaround that kinda does the job, although an integrated autobet function with a GUI would be a lot better.
You can use it as an interim solution.
Personally, I'd like to see an autobet option on roulette as well, I'm not a big roulette player, but the way I see it, the demand for it among users is big.