I can totally see what the OP is getting at, but really, I think the option is there already. It will just take a few minutes of work on your part to unselect those characters for that particular lottery. The amount of time it would take a dev to code the solution you're seeking would be significantly longer.
And really, lotteries are a bonus and not guaranteed nor is there troubleshooting/help readily available for them. It is just a nice thing the company does for players who are interested in participating.
At home on Nimrodel for 4 years.
Hadleighy/champ/100 (main), Brynnraen/guard/100 (retired main) , Zarefina/mini/100 (solo), Hazriel/LM/88, Rachlarien/RK/83, Brynreign/Beorn/71, Rudbekia/burg/34, Aysawen/capt/36, Haddley/hunter/16