From what I understand your total crit chance isn't capped, but the amount of crit chance you can get from willpower and crit rating are separately capped at 30%. The benefit to crit chance of willpower is not linear, but at current realistic values of willpower it is so close to being linear that you can probably ignore the diminishing returns unless you are getting into very intense theorycrafting.

I'm pretty sure the OP means that the bonus is limited to 50% Crit bonus damage starts at 50% and the cap for aditional bonus damage is 50%, so if you stacked as much surge as possible you'd end up with just under 100% in total because you can never quite reach the cap. The cap is just for Crit Rating, which is one of several things than can effect your total Crit Chance. Your total Crit Cahnce is calculated as follows: 5% base + X% based on your Willpower (capped at 30%) + X% based on your Crit Rating (capped at 30%) + Crit chance granted by skills or buffs. A rough example from what I remember of my own stats (can't log in right now): 5% base crit chance 10% crit chance from having 1500 willpower 13% crit chance from a crit rating of 350 5% crit chance from skills Total crit chance is approximately 32%. If an operative comes along and casts their 5% buff this increases to 37%. The only parts that are capped are the contributions from crit rating and willpower.