Some interesting responses... I'd like to go back and edit the original post but due to the way this forum is set up the edit option isn't there any more.
I did some more tinkering with the USB keyboard feature, and found the following.
POSITIVE CHANGES- USB Keyboards now working.
- Keymap is as follows:
- Esc = CLEAR
- F1 = Home Screen/toggle to My Shows if on Home Screen
- F2 = TV
- F3 = Guide (EPG)
- F4 = CLEAR
- F5 = Thumbs Up
- F6 = Thumbs Down
- F7 = Channel Up
- F8 = Channel Down
- F9 = Record
- F10 = Info
- F11 = Home Screen (Old style TiVo SD menus)
- Backspace = Delete (only when typing)
- Both Enter Keys = OK
- Pause Break = Play/Pause
- Cursor Left = Left/Back
- Cursor Right = Right/OK
- Cursor Up = Up
- Cursor Down = Down
- Main Keyboard Numbers/Numpad = 0-9
- Keyboard Letters = Work for searching in HD and SD TiVo menus, including within new YouTube app, but not within the old one or the iPlayer app.
- Sadly keys like Insert, Delete and Home don't do anything, and there is no way to control rewind/fast-forward/stop/slow or colour button/last channel/subtitles functions, so it's not a full replacement for the remote.
- USB keyboard can power up the TiVo if it's on standby (use F1 or F2), but can't power it down.
- Media keys on certain keyboards appear to have no effect.
- Using modifiers (Shift/Ctrl/Alt) appears to have no effect, although on Esc - F4 nothing happens suggesting that once they might have done something.
- Be careful with the two clear buttons, especially when in My Shows!