So it's been decided. Here's what we're going to do:
We are going to implement the fuel idea. However, there will be a command in-game that enables/disables bot stract's bonuses, and if disabled will not remove any stract after your game. It is enabled by default, but a warning message will display for those who have it enabled upon login.
In addition to this, the fuel exchange will be created, and will allow 5Mil gigas to be transferred to 10k stract. This will not allow transferring stract to gigas, however.
The HP bonus will also be implemented, however will be capped at 4500, making 2,250,000 the max amount of bot stract needed for the highest bonus. The 0.7% fuel implementation will only affect a maximum of 2,250,000 stract, meaning the most bot stract you can lose in a game is 15,750 (0.7% of 2,250,000 stract, because the highest bonus available is at such number, there's no need to use any more fuel).