It's hard to tell what you're asking "what" about, but I assume Tower Shields and one-handed reach weapons.
Well, first off, I think all shields should give you a bonus to your Reflex Save equal to half their AC bonus. Or their AC bonus. Whichever. It makes sense to me, and feats like Shield Wall use it. Speaking of which, that seems like a simple maneuver that anyone trained with a tower shield or heavy shield should be able to do....
Additionally, if I'm wearing a shield(especially a tower shield) on my back, I think it should provide a bonus of some sort(only whilst my back is turned, and wouldn't stack with a shield I was holding, but if I'm using a crossbow for example...there's a reason Pavise shields were used. Or just make it so you can reload a crossbow even while wearing a shield(it's not as if your arm will fall off because you let go of the shield handle for a few seconds...)
But as for tower shields specifically...I'd really like and I feel as though some of the following should be done to them, possibly all:
Not give the -1 to hit with them;
'Block' spells when being used for cover;
Not give total cover, just 9/10ths or something(cover should give bigger bonuses to reflex saves, too...)
Be able to shield bash(speaking of which, shield bashes should do more damage; Spartan/Greek Hoplite shields were as deadly as their spears...), perhaps for a little less than a heavy shield, but still. Maybe only on a charge or something when you can get enough weight behind them.
Not weigh stupidly ridiculous amounts. Seriously, they weigh more than full plate. That's just dumb. 25 to 30 pounds, maybe. Not 50. 50 would be for a steel one. A solid steel one. Which, by the way, if it was two feet by four feet, would be about 4 millimeters thick. Stupidly thick. Even at a meter by two meters, it would be fairly close to plate armor thickness. (1.45 millimeters, versus 16 gauge (the thinnest typically used) which is 1.59) If it's made of wood...oak has about a tenth the density of steel, meaning a centimeter and a half or so of oak would be fifty pounds, if it was 1x2 meters.
Plus, 50 pounds is just ridiculous to carry into battle.
I'll try and stop with shields before I launch into my rant about the equipment system in general.
For the exotic weapon, would this work?
1d10; 20/x3; Piercing; Can be set against a charge; Reach*; 7 lbs.; 20 gp; Can be used as a martial weapon in two hands.
*I really think people should be able to do something like Short Haft with all reach weapons, provided they are proficient with them...it takes an action after all! Or it should, in this case. Plus, it's not particularly difficult to stab with the longspear when you're just holding another three to four feet along it's length.