So many pros and cons on this one. I've also thought about it recently where sometime's it would be nice to just POOF my ship elsewhere to get closer to people. Maybe if this gets implemented it could have a limit, like 1 per day or 1 per 12 hour period. Similar to how you can only rename every 7 days. That way people will save their 'jumps' for when they might really need/want them. Not saying it will prevent all possible abuse, but will still hinder it quite a bit. People would not just use it at the drop of a hat, and actually put serious thought into whether it may be worth it to them or not.
Inrp just claim it was a bought and paid for HyperJump at the hands of a 3rd party. Now when you come across a pirate, and lose him, there's no guarantee he/she might not go buy there one jump and catch back up to you, or worse, cut you off! I like it! Every's ship gets their 1 jump every X hours. Its just something else you'll have to factor in. "Does this guy have still have a jump available? Do I feel that lucky...punk?"