I think that storing your keys in a cold wallet is important. Users will be able to store their Crystals safely. It can also be useful for the safety of validators if validators can use the Ledger in their work.
Ledger is the best choice for integration.
In the future, making FreeTON cold wallets might be a good idea.
Are you sure that this iniciative is so required on the first step? When there are not so many users with TONs?
I think that this is important even at the initial stage. If possible, the best thing is to do it faster.
This is a security issue for both large and small balances. Validators can also use this.
Its in production now. Supporting Multisig with recovery. Will announce next week ready for pre-orders.