[Phoenix-D]

"If you set engines to 0, I suppose you rule out the base thrust component which allows tactical combat movement only for bases, right? or there is a way to overcome this?"

No. The engines allowed entry only refers to "Standard Move" engines, not "bonus move" "extra movement generation" or (important) "combat move"

Note, though, that none of those stack. So your base can put as many base thrust components on as it likes..but only one will work.

"Thinking about: Would it be possible to make Stellites capable of tactical combat movement only (not a lot of mobility, say 1 or 2 squares, kind of seeker sats)?"

See above..same deal. use the combat move abiity.

"Another one: What and where are the "Default entries"? My apologies for my ignorance!
Oh! I see, I think it refers to the line in the VehicleSize file, right?"

Yup.

"I think I would have to edit the Base only componets with the Ship\Base allowance."

Also yes. Keep in mind they could be mounted on -any- ship they can fit on then.

Phoenix-D