I agree it would be a nice thing to add.
I've never used exhaustion points myself. Thinking about it, the EP could be automatically tallied when attacks are made, as long as there are set rules for how many EP are spent for each type of attack. This I'm not familiar with and would need to refer to the rulebooks. And then of course each set of rules may deal with EP differently. Then there would need to be a way to manually enter EP for actions other than attacks. Then those EP would need to be factored into any (negative) modifiers to attacks/spells/actions.
So I agree it would be nice, but quite a lot of work.