Ann: SDL to Launch Capital Raising, page-57

I believe the answer is NO. An ASX rule. Something about being fair to investors that have bought and sold company options already. If they knew that the details of the options were going to change and be more favorable, maybe they wouldn't have sold. (and a few other scenarios that could happen. Eg invested Directors changing options to their own benefit).
Don't remember which ASX rule, I believe it may have been answered by Robo24.
I know that's not the most detailed answer and backed by links, just what I remember.
I'll take a look around.
All Imo.