Your system specs are very low end, BigBox does require higher system specs to run smoothly. A better graphics card would help but since you are using a laptop that is highly unlikely to be upgradeable.
BigBox has this feature as well.
No.
This is not what the audit tool is for.
Yes there is another button you can press, check your controller mapping settings in BigBox to see which button it is exactly, by default on an XBox controller I believe it is the X button but I am unsure off the top of my head.