Shatner is an over-actor, plain and simple. It's just not about the pauses, it's the entire package. I love his treatment on "The Family Guy" which parodies him to the extreme.
You can't count things like that, because ever since Airplane II, Shatner has based his career largely on parodying his own exaggerated reputation as a ham. It would be nonsense to interpret that self-parody as being the same as his dramatic acting style, when there's a wealth of filmed evidence proving the difference.
This is the same unfair stereotyping that ruined Adam West's career. He was a superb actor, and on Batman he was hired to overact and he did a brilliant job of doing just what was asked of him, which unfortunately led people who couldn't tell comedy from reality to believe that overacting was all he was capable of. And like Shatner, he never really had a career renaissance until he stopped fighting that stereotype of being a ham and embraced it. He, too, has built his modern career on parodying his own image. And while I'm glad he bounced back, it's always upset me that he was never given his due as a serious actor.
It's not stereotyping, everything he's done, from Twilight Zone, The Outer limits, TJ Hooker, Columbo, Denny Crane in The Practice and the Boston Legal is in the same style. For an even more exaggerated performance watch the 1966 Esperanto film, Incubus. I didn't even need a translation, his body language and hand gestures said it all.