Enable "BackTab move-to-prev-xref" with --vi-keys?

[Sebastian Carlos]

Hello,

I noticed that the following configuration is enabled (on the H panel) when not using `--vi-keys`:

 

```

BackTab (move-to-prev-xref)             Move to the previous cross reference

```

But it is not there when using `--vi-keys`.

Is there a way to enable BackTab (SHIFT-TAB) to move to the previous cross-reference when using `--vi-keys`?

In particular, is there a way to set BackTab or SHIFT as a valid string in the `#info` section of `.infokey`? I couldn't find anything about that on the documentation (`info info infokey`).

Thanks.