From: http://lists.cendio.se/pipermail/thinlinc-technical/2013-July/000351.html "Is there a plan to integrate the tab key, cursor keys, esc, etc. also in this HTML5 client as it is integrated in ssh tools like iSSH (http://www.zinger-soft.com/iSSH_features.html)?" Also, I tested with our physical Target Bluetooth keyboard today. It doesn't work either, except for the Tab key. At least on the iPad, there's plenty of room in the control bar for extra buttons, so we should be able to implement this.
Fixed in revision 27730.
Updated in revision 27817.
Additional update in revision 27819.
CTRL, ALT, TAB and ESC all work fine using the GUI buttons. I think this is good enough to close the bug. Perhaps worth noting is that none of these keys (except tab) work with an attached bluetooth keyboard on the iPad. xev gives no output, so I guess they're being captured/ignored by iOS. Pressing ESC exits to iOS's main menu screen for example. I'm not sure there's much we can do about this ATM, so closing.