Turn it sideways for a split keyboard.
In landscape the keyboard splits into two halves at the bottom corners, sized for thumbs, with the palette split above them. Everything else, including the corridor between the halves, stays one continuous trackpad.
Landscape uses the same layout as the iPhone keyboard split in two, with shift and caps lock, 123 and #+= pages, accent pop-ups, delete repeat, cursor drag on the space bar, emoji and dictate keys, and an arrows key.
Bring your own keyboard on iPad.
A hardware keyboard connected to the iPad passes its keys and modifiers straight through to the computer.
Talk instead of typing.
Tap the mic key on the iOS keyboard and talk; words appear on the computer as you speak, corrections included. Dictation is available in portrait with the keyboard up. iOS performs the dictation, and the text it produces is sent to your computer like typed text.
Send your clipboard across.
Two clipboard keys move text both ways: Paste in sends the text on your phone's clipboard to the computer and pastes it, and Copy out copies what is selected on the computer and puts it on your phone's clipboard.