Best advice is when you truly feel something isn't working (for example you always wanting to press a different panic button instead of the one bound), just switch your binds up immediately until it truly feels great to play. Really don't start learning annoying binds, more often than not you know immediately if you like something, like me still switching a grenade to 4 instead of G in any shooter game, having it hardwired from my cod1 days.
Shaman in raids will involve a lot of totem spamming, I always found that agi/wf being next to each other for proper weaving I required to have my nights be somewhat chill, for example.
As it stands now you would be F-->tab C (on some pulls)---> F --->tab F--> f--->tab F--->f----> tab F..... etc a lot, I really don't see how that will be chill during a raid.
Tab as a modifier I find somewhat lacklustre anyway, you have to leave your movement keys then, as my hand would die having to reach to tab all night with my pinky. You have some shift/ctrl hate?
Lastly don't overdo it on the binds if you find that uncomfortable, mana pots and runes for example can easily be clicked, the slow pacing of vanilla allows this easily. It's often mostly mechanically weak players going off about their keybinds, as if it's this hard for any normal player to manapot inbetween casts.