If you're a sysadmin, this is the most painless way to do your job in iOS. The app automatically saves server info for easy connections, keeps sessions alive while multitasking, and adds a handy row of keys atop your onscreen keyboard that includes control, tab, and escape, along with several customizable slots.
WIRED Full Bluetooth keyboard support. Auto-completes common commands.
TIRED A medium text size and transparent keyboard would be the cherry on top.