I had the exact same complaints about the Clickpad on my T440s, and replaced it with the pad from the T460s. You can find the part on eBay for around 45-60 USD

I had the exact same complaints about the Clickpad on my T440s, and replaced it with the pad from the T460s. You can find the part on eBay for around 45-60 USD and instructions to replace. It's a bit fiddly of a replacement, but mine works great!