Completely disagree with OP. For spells of the "cast spell" type, hand gestures is what is gone for, has always been used before in other fantasy, and works really well from a balancing standpoint. Plus it looks natural.
In other dice RPGs I've worked with other types of spells as well. Runes (hand still needed to "prep" them), meditational/prayer based (not suitable for the "common gamers" here), verbal (we have shouts), ritualistic dancing (druid like, takes far to much time for the "common gamer"), scroll based (verbal/instant, but still need to hold the scroll), and staff based (need to "fire" it, just as we do here).
So we have hand gestures, shouts, scrolls, runes, and staff. From a CRPG POV, I'd say most bases are actually covered as far as "non tedious" casting methods are covered. I think we lack a bit on how magicka is "sourced", but with regenerative magicka (hail "common gamer"!

), that's not something to spend time on either. You should really see a complex magic system in action. It's not, this...
I don't like to praise Oblvifail, but casting was much better in that game. It wasn't nearly as awkward and fiddly as Skyrim's gimmick dual wielding/casting system, and you there were never any issues on you being able to block with the weapon in your other hand, should your magic fail to stop your opponent.
That's pretty much the same as an archer have to endure. With the exception that archery feels overpowered so you don't really need anything else. Learn to use the hotkeys, as an archer relying somewhat on Alternation, I have no issues using spells while using the bow. We both are chicken standoff fighters for as long as possible. You chose to live the life as a double casting mage, now deal with the consequences of not being a spellsword - isn't consequences something we want?