Add new feature to relative orders: manual offset selection

[CryptoKong]

It would be good to manually select the offset for each asset rather than working from a pre defined spread. At the moment we can select, for example, a 1% spread. This places orders 0.5% either side of the centre price. I would like to be able to manually input values for each side. For example, I would like to be able to set an off set of 0.5% on the buy side but have a larger offset of 2% on the sell side for when the price is trending upwards. When price is moving up your sell orders are more likely to be filled and buy orders less likely. I also believe users should have the ability to have more control over the settings. This would help very much with that.

[MarkoPaasila]

Increasing the spread to 2.5% and increasing center price by 0.75% would have the same effect, and seems to fit better into the current model where offsets of both sides aren't defined separately. Would you approve an additional setting where you can manually define an offset? That could be used in combination with auto-offset or without.

[CryptoKong]

Yes. Theres no need to offset both sides if we can manually move the centre price and alter spread. The result is the same. Thanks. A slider on the GUI for this would be really helpful too but not essential.