| Anyways while on the subject of capitols if a tech capitol was built on a 700 bonus to research, would I get any bonus or no bonus wich I suspect to prevent the person from becoming over powerful. |
No bonus.
Honestly, this should be changed. It can be a huge pain if you capture a capital on a crappy planet before you've build your own, since now you can't build one on your good planets. What do you do there? Sell the planet, build your own and re-invade? Works but it's rather cheesy. Spy on planets and make sure you don't take one with a capital? If it's before you've build your own capitals it's too soon for you to be a decent spying levels and on larger maps it takes far too long to inspect every planet you might invade even if you have a suitable number of planets. Just why is my empire so keen to make a low-pop planet taken from a failed race my capital of building/research/politics?
I suppose the reason for making them indestructible is to stop you moving them around to focus the bonus on different planets as you need them. That's fair enough, although you can get around that by selling the planet to a weak race, building a new capital and then invading your old planet (I never do this, but it's possible. For an ironic twist you can even build transports on that world to empty it just before selling and then use the planets own pop to easily invade the empty world), but why not allow captured ones to be destroyed? The game does keep track of which planets are captured (see details screen) so it should be possible to code it so that capitals build on your own worlds are the same as ever but those on captured worlds can be destroyed. This way you can't exploit capitals any more than you currently can, but you CAN get rid of capitals you capture in a less cheesy fashion.
Come to that, why allow multiple capitals at all? Another solution would be to only allow one capital per empire. Upon taking a planet with a capital you'd get a popup asking if you want to move you capital to this planet (destroys old one, or could replace it with a building, eg lab for tech capital, factory for manufactoring etc.) or destroy the captured one (again, could replace with a building of the same type). This could also help with situations where you capture a capital before you make your own as well, the popup could appear even if you don't currently have your own capital of that type. It would also stop players from collecting multiple capitals and allow you to get rid of capitals build in poor locations.