can we get a sweep private key feature in mytrezor.com? please, please, with sugar on top

use case: enter private key in the web form, use as input in a payment
send the coins to either a trezor address (sweeping) or any bitcoin address (payment) with the rest going to trezor ...

workaround is using any wallet that can import priv key. would be great if mytrezor would be capable of it.