I feel like a feat would be a good idea for this concept
Teleportation Initiate - Heroic Tier Feat
"After the first 100 times, the nausea starts to fade. After 500, you start to learn a few tricks."
When you spend an action to teleport, you can stand up from prone as part of the same action. In addition, once per encounter, you can double the distance of any teleportation you spend an action to make.
Teleportation Adept - Paragon Tier Fiet(Prerequisites: Teleportation Initiate feat, any power with the Teleportation Keyword)
When knocked prone, pushed, or pulled, you can teleport 1 square as an immediate reaction. This reaction must take place after the entire distance of the push or pull is resolved. In addition, add 1 square to the distance of any teleportation you spend an action to make.
Probably pretty weak, but that was fun anyway.