nah, actually not. Because it was not money, it was work time. Depending on your current location and the status of whatever location, they had more or less time for your fleet. You don't buy, you order the support guys to equip your ships. Also, there was no almighty shop, you had to work with they had in the supply chambers and the nano-technology of the Anglewing (if you install any item in the Angelwing at least once, the ship's systems can recreate that item and there is always at least one of it in the cargo hold).
During missions were you were on your own, there was no reequiping.
I really liked the system.
And yeah, there is the undo button. Also, you can just load your game.
You know, I think I am going to replay it again. Once again. Hell, how many times do I have replayed that brilliant game already?