You laugh, but for the longest time in the 10.5 and 10.6 days I couldn't name a file with an "F" in it. So pressing "F" in Finder was out of the question. Can't remember what exactly it would do—either close out of the naming window, stop the renaming process, or maybe freeze up briefly. But each time I could never get an "F" into a file name. Unfortunately for school I often had to turn in design assignments with the current semester in the file name, so it would be like "Project-Name_Duke_Fall-08 or something like that. So I always had to go find an "F", and copy and paste it. Was so weird and I would forget about it nearly every time.Because in 10.11 the caps lock key gets stuck and the OP wants to know if it is fixed in 10.11.1.