You can find my Manual of Arms here; if you like my posts about weapons, you'll certainly like this book.
Anyways, one thing I found is that by adding the trip propriety to the list, I can fix most of the issues I have with martial melee weapons:
Trip: This weapon can be used to trip a creature, knocking it prone. It uses the same rules as Shoving a Creature. However, you cannot use this weapon to push a creature away.
Add this to the flail, warpick and trident to make these weapons more useful; you can also add this to the whip and halberd to add flavor (you need to add something else to the glaive).
There is an entire book to be written about grappling with weapons, of course. But this single propriety is small enough to fit in the existing rules (disarming, for example, is an optional rule, while "Shoving a Creature" is not) and to add some extra nuance, detail and balance to the current weapon list.
By the way, if you WANT to read a whole book on grappling, I'd recommend Dungeon Grappling* by Douglas Cole. There is a review here; might be worth mentioning that I wrote a page in one of Douglas' books (Dragon Heresy) but that was a while after I had posted the review. [Affiliate link - by using this, you're helping to support this blog!]