Regarding means for fast transport, I would point you to my own post aboutthe Sylph (shameless self-promotion).
You will find various enchantments that with minimum tweaking can give you a faster transport or made of another material.
Those enchantments are based on the Hermetic Shipyard (in Hermetic Projects), and the Flying Castle (Legend of Hermes).
Now, to answer other questions, it will depends on your settings:
- what is the average delivery time for Redcap ? If it is within a week or even within a month, unless very urgent request, the 24 hours delivery is only a "nice to have". People are used to wait, and the unit of time for mage is the season. Mechanically speaking, there is not benefit to have another time scale and the whole Order is used to count in season. So it is only within the frame of specific adventure than speedy delivery will matter (need to a tablet with a specific spells, shortage of virtus...);
- how often are Redcaps mugged ? As per core rule: rarely, "everybody" knows that's bad luck to mug a fellow wearing a Redcap. Death usually follows such rare event. If your setting is in the earlier stage of the Order, where this reputation does not exist yet, then yes, having safe delivery of precious books is at a premium. Not so much speed, but safety of precious cargo matters.
Decide how is your setting and how these two points would benefit from "The Courier".
A point to keep in mind regarding speedy delivery:
Speedy delivery works only if "The Courier" knows quickly where and when he is needed. So he needs to have some form of instant communication. And if a mage needs to find a Redcap to pass an order for speedy delivery, said Redcap needs to contact whoever has the magical item/spell to contact "The Courier", then it is not really instant delivery anymore. Keep in mind that affecting a target without seeing it requires an Arcane Connection (typically to send the mental message "I need you tomorrow at Durenmar"). I don't think that the Courier wants to leave Arcane Connection everywhere...
I could see some organisations having dedicated express delivery system: Quaesitores, Tremere, but it is not part of the core background. This is the part left to each Saga to define how much is "optimised" the Order: is it well organised and leveraging 100% of its potential to be efficient, or is it only a group of secretive scholars who meet every seven years to try to outdo each other with more brillant discovery than the neighbour, but reluctant to collaborate for the greater good ?
I personally tend to always start with a relatively stagnant Order, living on the great work of the founders and some of their descendant. It leaves more opportunity to the players to leave their mark and stir the Order in the direction they want.
Finally, I would suggest to have a peek at "Transforming Mythic Europe", specifically the part about Printing Industry, contributing to spreading faster and further away knowledge and discovery. Because basically, that's what fast transportation will do: it will shrink virtually the world, allowing exchange between people that would never have met otherwise. House Bonisagus publishes every 7 years (serf's parma) a compendium on one topics: that's not a fast-paced rythm of production, and there is also some censorship of some topics I am sure. If mage can freely, quickly travel without having to learn specific spells or design tailor-made spell to prevent warping, they will directly meet the two other specialists in their field to share idea and make progress faster (think about Breakthrough if spread between three or six mages, sharing their discovery to quickly build up breakthrough point).
House Bonisagus might feel its authority challenged if significant advance are made without their involvment, because an ExMiscellanea from a forgotten tradition teamed up with a Criamon (meddling in the same area of magic theory) and a Tremere (to structure this collaboration) to integrate some useful techniques breaking one of the Minor (Major ?) Limit.