1)if bitcoin system Same in all over world why some wallet can control fees and others cant like Blockchain.info ??
2) How wallet work with short word ??
1.It is their personal decision that to implement the customize fee or not but most of the exchange wallet have high and fixed fee but some wallet have fixed fee according to the current situation on the memepool so the fee will be low if the memepool is empty.
2.What do you mean by short word,you mean tha password?.