1 - New feature Ticks = % (if this is enabled do you then specify the % via the Fill % option ?
No, the percentage is entered in the tick offset box where you would normally enter the number of ticks.
2 - Is it necessary to enable Auto-level when using Tick offset and Ticks = % option
No, it's up to you whether you want to level the profit across the field when the offset bet is placed. If you don't enable it then the stake used will be the same as the original back or lay.
If for example i lay for £100 @ evens and have my tick offset to back at 5/1 with Ticks = 25%, will this then back 25% of my stake back at 5/1 ?
Only just begging to use this so sorry if its a stoopid question.
The percentage does not refer to the stake, it refers to the odds. eg. if you back at 6.0 with an offset of 25% then the lay bet will be fired at 4.70