I've always frowned upon bumdling skills together into macros, it just cuts out the ability to optimise on the fly, and our rotation isn't the most complex (certainly not the easiest, but we're not exactly ICC kitty durids either!)
I have HS bound to 'mouse wheel down' and always have. In ICC I was constantly spinning my mousewheel, because that landed more HS than binding it to other skills. In Cata on raid bosses I'm normally still spinning my mouse wheel because rage is no issue, but the moment there is a drop in rage income (offtank taunts on Chimaeron, the duration of the channelled breath on Valiona etc) I'm ready to simply stop spinning and pursue a more 'normal' rotation, fitting in the odd click of HS if I can. Then rage generation increases and Ima spinning away again.