Ships coming to pick you up where ever and when ever you wanted wouldnt fit into the game well, it would be emersion breaking.
The speeders go at 110% added onto your origonal running speed so you are effectively doing 2.1*your normal speed.
You must also take into account that a higher movement speed may not work in the current game for technical reasons; the reason why taxies work is because they are fixed routs that you cannot controll.
If you dont want to look at the scenary on your other charectors you will probably get bored of repeating the quests aswell, because they are mainly the same for every class.