iOS Plugin is great - thankyou. Following your request for feedback, I'd make the following suggestions:
Allowing the user to select from a drop-down list of connected devices (or 'recently connected' devices?) by name rather than having to specify a UDID specifically (can get tedious copying and pasting this from the 'Connected Devices' view)
Allowing the user to set a default such as 'Connected iPhone' + iOS Version or 'Connected iPad' + iOS Version for installation purposes.
Support for .app files in addition to .ipa would be handy
Would also be a good idea to allow deletion of the .ipa / .app prior to installation via Jenkins (checkbox?).