Thanks all. There are of course some bugs in the current release which have been fixed ready for this week's release. These include some aircraft parameters (cog envelope, max fuel) not being saved. Another bug is that the scale in the weight/balance window is always in kgs even when lbs have been selected as the general unit. This has now been fixed.
mstram, to remove a waypoint from the route, click to select it then press delete. Ctrl-clicking already does something (creates user waypoints during route planning). The airfield "plates" will continue to evolve. If you can identify a specific airfield for which the "plate" looks rubbish, do let me know.
As far as lever arm is concerned: the units for this are unlabeled because it doesn't matter whether you use inches or cm. As long as you're consistent between the aircraft CoG and the loading points, and also the envelope, you can use any unit you like.