Ex commands don't accept a `[register]` parameter (neovim enabled)

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Is this a BUG REPORT or FEATURE REQUEST? (choose one): FEATURE REQUEST

Environment:

• VSCode Version: 1.17.1
• VsCodeVim Version: 0.10.1
• OS: 10.12.6

What happened:

I have neo-vim integration enabled in my settings. Ex commands like copy, move, and delete work fine, and I can yank into the default register like this no problem:

:40,50y

However, when I specify a register in which to yank, register x, nothing happens:

:40,50y x

:reg
//register x is still empty

The following Vim Ex commands all accept a register parameter:

:[range]delete [x]
:[range]yank [x]
:[line]put [x]

Here is some more info from the official vim docs:

*:y* *:yank* *E850*
:[range]y[ank] [x]	Yank [range] lines [into register x]. Yanking to the
			"* or "+ registers is possible only when the
			|+clipboard| feature is included.

Is this possible in VSCodeVim?

What did you expect to happen:

I expected to see x set in my list of registers (:reg), and expected to paste the contents of that register somewhere: "xp

How to reproduce it:

Try to yank the current line into a register: :y x

No implementation files or tests are named. Start by tracing the Ex command handling for delete, yank, and put, then reproduce :y x; done means the specified register appears in :reg and can be pasted with "xp.