DCG does not create "contrived" missions (where contact will occur only at waypoints). It may not even create any contact at all. Warping in DCG will often mean you miss the action, but if you like to warp, there are a couple "rules" you might want to follow.

Scramble and Intercept missions. It's okay to warp the first waypoint (quick way to get some altitude). From there, unless the distance to the next waypoint is more than 80 miles, I recommend you just use accelerated time (CTRL-T and CTRL-R).  Note: scramble missions mean that eventually the enemy will attack your home base. Intercept mean they will attack the target listed in the briefing. So if you hang around them, you should see action.

Strikes, Sweeps, and Recons. Warp the first two waypoints but then fly the next two in accelerated time. Usually contact is made within 10 miles of the target. After that, warp home.

CAP is the least likely mission to have an encounter. If you're not a real die-hard, just warp through it and chalk it up as a mission with no encounters.

The file is not missing.  The error is actually the second error listed by the Exception Box.  Your DCG executable file and the dcg.ini file are not in your main CFS2 folder.  In order for DCG to function correctly, these two files must be located in the same folder as your CFS2.exe file.

Either one is spelt differently than the other or there is an "End of File" (EOF) character before the end of the airbases.dat file.  Open the airbases.dat file in a text editor such as NotePad and look for a "square" character before the end of the file.  Delete if found.  DCG is not reading past that character as it thinks that character is the end of the file.

Yes, you can create a campaign for any one of the following nationalities: British, German, American, Japanese, Italian, or Australian.  Instructions on how to edit the DCG files are found here.

Once your plane has reached the first waypoint, anytime you press and hold the brake button, your waypoint will reset to your home base.

The problem is probably in the INFO\airbases.dat file.  The altitude listed in the airbases file is supposed to be in feet but some may have been entered incorrectly in metric.  If you isolate the crashes to a specific airbase, you can check the altitude of that base by running the Mission Builder and placing the mouse over the base.  (It's best to zoom right in before taking the reading).  The altitude will appear in the bottom left display.  Make sure your settings are in feet.  Enter the altitude of the base into the airbases.dat folder.

This error can occur for two reasons, either an airbase altitude or heading includes a decimal point in the INFO\airbases.dat file, or a value in a DP file's [MISC SECTION], such as cruise speed or altitude, has a decimal point or additional information after the number (for example, "kph").  In either of these cases, round up to the nearest whole number and/or delete information beyond the number.  DP's checked include planes, ships and objects.

Paul Hauschildt has created an excellent utility for use with DCG and CFS2: "DCG Check".   This program checks all files used by DCG such as the airbases.dat and all plane and ship DPs to see if there are missing or incorrectly formatted data.  If it finds any potential problems in these files, it generates a page showing what might need correcting.  Highly recommended for serious DCG users. 

Grab it and his runway management program here.  If you have questions or concerns about either of these two programs, please contact Paul Hauschildt.

The assignment of missions is based on an aircraft's category.  Open the DP of the plane you are flying and check the category and ensure it matches the type of plane you are flying.  Some categories include:

1 = Fighter
2 = Heavy Bomber
5 = Medium Bomber
9 = Transport
10 = Torpedo Bomber 

Other than changing the display settings in CFS2, there are a couple of things you can do in DCG.  You can reduce the number of planes in each flight by setting the "Small Squadrons" option on.  You can also reduce the chances of squadrons and/or ground objects from appearing by lowering the "Density" settings.