This is a somewhat niche thing, but when I'm using my iPad and a Bluetooth keyboard in the catbox, it registers key presses as doubled ALL THE TIME. It also then double-registers the backspaces so correcting each can take like 5 cycles. I think this is because there's a lot of JScript stuff going on with the catbox and iPad Safari just can't keep up. It also loses the insert point when the 'box autoupdates and scrolls. The double-type doesn't happen when editing nodes, just in the catbox (with autoupdate on).