[Ragnarok]

1) mine decay rate.

I wouldn't mind seeing a system such as this. Stars! had it and I liked it.

2) mines should dammage ships in a fleet randomly instead of one afer annother.

I like this idea as well.

3) different types of mine component - this could be interesting, mines that only take out engines, shields, etc.

This would be interesting to see as well.

here is an idea I would like to propse:
mine fields that can be orderd to dettonate on all empires, only enemy empires, or enemy empires + empires X, and Z. this could be usefull for protecting those home systems especialy good for the more xenofobic races.

I really like that idea. That is something I thought should be in the game for along time.

Another thing I would like to see is that you have X% chance to navigate through a minefield. Then either a component could be made to better your chances by providing more expierienced pilots or navigation crew; or each time you successfully fly through a mine field without taking much damage you could gain expierience in this regard and have better chances of successfully navigating mine fields in the future.