We could absolutely start adding more and more routes like that to simplify things. If anything, I'd probably end up mirroring the steemconnect links so that they're interchangeable. The base64 route was the path of least resistance, since I could use a single route (/sign/tx) to do every single operation.
It's also not all that hard to actually create these links:
const base64_ops = window.btoa([
[
"transfer",
{
"amount": "10.000 STEEM",
"from": "",
"memo": "",
"to": "anonsteem"
}
]
])
const base64_app = window.btoa({})
const url = `steem://sign/tx/${base64}#${base64_app}`