It is possible in 4.4 version to change landscape mesh tesselation.
In your mesh go to Manage.
Click the Selection icon (it is a rollout) and choose instead Change Component Size.
Set the Resize Mode to Resample.
Change the Sections Per Component and/or Section Size to suit, and press Apply.
Note - if you are in wireframe mode when you do this you can visually see the
updated tesselation to gauge density. If you overdo it, you may get massive lag.
