Hi!
I love playing mechanist and am so glad that this class exists now, with traits customizing behavior of the mech :)
One thing that bothers me and seems to be a problem to other people (based on reddit posts/comments), the F4 skill seems to be prone to be misclicked and causes mech to disappear and go on cooldown in the worst moments. As others pointed out, other tool kit skills of engineers have active skills on F4 and it's easy to click it on mechanists out of muscle memory.
I propose an option to cancel calling off the mech by clicking F4 again OR, which would be even better, moving that skill to F5, which will minimize the chance of accidental usage. Call or recall skill isn't a frequently used skill (maybe when your mech dies a lot), so really shouldn't be so close to other active skills.
Thank you!
PS: We can rebind F5 to something else, of course, but keybinds are a global setting and will change for all characters and specs and the problem seems to be much smaller.