I’m the creator and official maintainer of that package. The reason for this package is that I wanted a kernel lightly patched with some improvements on daily compute tasks and games as well. I was compiling it for myself and I thought it would be nice to share it also to friends and others.
So far the BFQ is the most interesting thing. 1000Hz is for faster switching on programs with multiple threads/processes, hipotetically resulting in a lower latency. xpad integrated is because I already wait too much for dkms every time I update a kernel
About trusting issues I totally understand you. I did as little modifications to the official linux ARCH package so that comparison should be as easy as possible. I encourage you to check the PKGBUILD and compile it on your own.
The repo was mostly for easily share the compiled kernel with my computers and friends. It’s signed with my key and you are free to use it if you want.