the amercain idiot,
If you are using a copy of default door - then open your fpe for the entity. You wont find scale because it does not exist.
You can add the scale command after the line rotz =
Code to add :
scale = "yourscale"
e.g. double the size (200%) add the line :
sacle = 200
Adding a scale command on any FPSC default entity that dont have it by default normally works fine without any probs as most objects are quite simple - Your destructable entity should be fine - though with something like a default set of animated doors - it could possibly have undesirable effects - as for it to work propely one has to presume that the command will also scale the embedded animation data correctly. It could possibly be the case that double doors for instance may not open wide enough or some other similar effect.
Trying it is the only way to find out if it works OK.
Scaling the .xfile in an external model editor would probably do more it with more certainty and its easy enough to scale any model you make yourself in a model prog of course - thats obviously the most exact and credible method.
Hope it goes well for you