I agree Glorelendil... this would be the way to do it. It would allow Rangers to spend more Hope, but it would have to be in service of protecting others. It's very elegant, doesn't change the rules significantly, and adds a bit of risk for the Ranger to gain more Shadow or not regain a point of Hope at the end of the Adventure.That way they can potentially spend a lot of Hope in the service of protecting all of their various Foci*, and if they keep them ALL safe they'll get one point of Hope back, but if any of them get hurt they get a Shadow point. And otherwise you leave the RAW intact: they cannot draw from Pool.
Thoughts?
*At one point we had a discussion about what "directly protect or favour" your FF means. I'd like to revisit that. E.g., does attacking a foe engaged with your FF count? I would think so. How about turning a failed Fatigue check into a Great Success, so that you can use the Tengwar to let your FF succeed? Again, I'd say yes.
With regards to "directly protect or favour" I've ALWAYS been confused by the fact that if you spend a point of hope to "Defend Companion" on your FF, you don't technically get it back if you read the RAW like a lawyer.
If I ran a game I would certainly allow this. It would let you "spam" Defend Companion, but the Enemy has plenty of ways (esp. with powerful foes) of overcoming high Parry, so that the Defender would eventually be unable to keep defending.