Simple suggestion as in the title.
Prevents accidental fat finger kicks from main by getting a confirm check before it actually happens.

How about an accelerated age end vote after 7 days and no timer yet still triggered? If passed (maybe by unanimous or majority vote of all countries LD/HC), it'll trigger an accelerated age end countdown. - 10 days if only 6 countries are left at vote - 7 days if only 5 countries are left at vote an...

what about commander specific skills that boost certain things?

like maybe... terrain specific skills
attacker or defender skills
certain formation types that boost certain units?