Most modern maps should have speed lanes when they are necessary. And if they have a 1 vs All fight, they should have built-in health or ability buffs for the activator.
Giving the activator blanket enhancements is a slippery slope. Aside from the fact it could interfere with any balancing built into a map, it makes it harder for mappers to create things that will work well on all servers, because each server could be doing something different.
If there are older maps where some balancing is definitely needed, then it's possible to change things only for that map.