I see your using CC 2014 on a Mac OS 10.10. I use a PC Windows 7 Pro with CC 2014 and a Wacom Intuos Pro. I have no problems when I use a brush type tool with shortcut keys. When I press and hold a key like H it works. If I press H it switches to the Hand tool. If I press an F key the Action or script I have it assigned to runs. It may be an Mac OS 10.10 problem. CC Update 14.2 did break some shortcuts but its hard for me to believe that Adobe could let a version of Photoshop out the door where brush tools broke all shortcuts.
An OS keyboard handler problem would be my guess.