Yes, there is a limit to the ordnance amount you can add to the game. I forget if it will cause crashes as you describe, but after you have made a large number of custom weapons, the ECM systems that show up in the load ordnance screen will disappear. You can increase the amount of custom weapons you can make by using the names of existing weapons as custom weapons. So, in addition to editing every existing weapon, there is a set number of new weapons you can then add.
You can change aircraft's speed with the flight envelop. Also be sure to change the structural speed limits in the controls menu for the aircraft. The flight envelop speeds are in feet per second.
Zephyr
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