Describe the bug
I do not see an option to store cs_file in an arbitrary directory of our liking.

The inability to do this breaks building caches for read only directories.

To Reproduce
Seems like you use Go, so browse into /usr/local/go/src/ and do a files listing.

Most likely, if you're doing this as your normal user, the /usr/local/go dir is read-only and a cs_file cannot be written.

This breaks ctrlspace's ability to list files utilizing a cache.

Expected behavior
A configuration option which allows a prefixed/suffixed cs_file to be created in an arbitrary path of the user's liking. Such as ~/.config/ctrlspace/ for instance.