[Nadia]

Thanks Nadia. I've been searching for the Mission Builder Plus mod which I believe needs to be used to open maps and reset the parking points but I can't seem to find it anywhere. Any idea where I could find it?

Don't know about the Mission Builder Plus. May be it is at SAS.
[update: got my FMBplus in the JSGME of my UP2.0 install; been activated for quite a while].
[This only gives new 'multiple objects' manipulating options for mission building: Not what U need; unless a more recent version was made...]
[Before that, was known as FMB-full, I think...]

To change actors.static (what U need), I use an earlier FMB map-builder's method obtained from the old AAA site, a while ago. See more below.

But here, right now at AAS: there is this tutorial on "map making":
viewtopic.php?f=70&t=14643
...and these instructions on "taxi-runaways" making:
viewtopic.php?f=70&t=10599

Changing actors is not mission building, it is map building.
I will try to find this simpler early AAA version from my archives. Here it is to download:
http://www.mediafire.com/?vrkttv0yyur8poo
Unlock FMB is what you need to do... and all what you need to do also.
(...since you don't want to "make" a map; you just need to edit the existing actors.)
After the 'unlock procedure', you load a map in FMB and you will see their white paths...
While editing them: just be careful about mouse dragging in this mode...
If that happens, U must reload your map; ... and loose your current work!.
( Keep in mind that loading from the game or Mapmods is not the same place as the save: in maps folder to be created below... )
Make previous saves of all files "conf" that you will change to unlock...
Save you're old conf.ini and more importantly you're bldconf.ini: YOU will need the 'play' version back in, unless you have two games.

So FMB must be turn into the builder's MODE:
[update2: To unlock, find 'Unlock FMB' text file, open it with Notepad and follow the instructions exactly.]
[Disregard the " item 7) " about using 'Files', since we now use Mods/Mapmods/maps instead, as I describe below.]

A maps folder must be created in the basic Il2 game folder and, within it, a folder(s) baring the name ( xxx ) of the map(s) you want to work on, must be created as well.
When changes to map and 'save' is done, the actors file appear there, then must be transferred/copied/ and replace the exiting actors in the
Mods/Mapmods/maps/xxx folder. (rename old actors: put x in front of it...)
For a map 'taken' from the game, you need to create the "mod", and use the proper 'load.ini' for that map to make it work.
(I have most extracted... using the 'sfs-extractor' V2.00 )
While in Builder's mode, save ( do not "SAVE AS" ) will save any modified files into the "maps/xxx" folder, such as, in this
case the 'actors'. Files saved that way, must be transferred into Mods/Mapmods/maps/ xxx file to become operational.
Also they can only be use or loaded from there... :|