It is quite easy for a terrain designer to restrict a field to certain plane types, the 163 is restricted to one field per side on all MA terrains for instance. However this is very unlikely to be permitted by HTC for an MA terrain. I know of no way of making ordnance permanently unavailable at a field short of building a custom airfield, which is not allowed for an MA terrain. They would not want airfields in my tank town crater as you'd have to have three to be fair and this would inevitably become a "fighter town", something they also have banned from MA terrain design. I was originally going to have three airfields in there until this edict was passed down.
A good rule of thumb in MA terrain design is; if it's possible and hasn't been done yet, it's not allowed.
BTW, to all those proposing 40k fields. The maximum terrain elevation you can have in any AH terrain is 32,767 feet. That's as high as the terrain editor will go. I can't see 32K fields being allowed for an MA terrain either.