chode, you just went to a random bf2 forum and hit the search button, didnt ya?
Sorry man, not that they're bad ideas, but they're individual [wants] requests, not stuff to just generally improve gameplay. This is more content requests than anything else.
I do agree that pistols AND silenced pistols need a boost in power. However.
Snipers have plenty of claymores, any more and they become an offensive weapon, which they shouldn't be.
Assault rifles don't need any tweaking of accuracy, they work just fine, without nearly the accuracy of a sniper nor nearly the power. Snipers don't need more clips, learn to conserve ammo. Deployed claymores are not easy to be disarmed nor picked up, so they should not be able to be picked up.
It has already been said that due to memory issues there will not be a third tier of unlocks.
Zip lines and grappling hooks stay in Special Forces, if you want em, get and play SF, they don't fit into regular BF2 without completely altering gameplay.
Artillery is a difficult point, some commanders just artillery spam in an attempt to win, and it grows bothersome, but there are two problems with increasing regen time. It hinders the ability of a good commander to use artillery effectively and it also causes problems for a commander on a losing team to turn the tide of battle. UAV's don't need tweaking, they're range is perfect as is they're effectiveness.
As a SpecOps player I want more powerful C4 or weaker targets, but it will have an adverse affect on gameplay. The weaker C4 limits the ramboing ability of SpecOps players, so they cant single handedly put the opposing commander out of commission.
Night versions of maps are pointless, as they are simply copies, and wouldn't add anything, simply splitting the playerbase for the maps (if anyone played the new copies).
Overboost run is out of place, since that's the entire point of sprinting. Running any faster and you'd be outrunning tanks and jeeps, and that's just wrong

.
Walled turrets on tanks... no, just no.
F2000 is 5.56 round, just like the M16 and AK101, its power is fine. The G3's boosted power and armor penetration makes up for its lack of a launcher, that's the point of the unlock.
Defribilator range needs to be practically point-blank, unless you plan on throwing those things at people!
OICW isnt in production, so no military actually uses them, the Five-seveN is not a military issue weapon anywhere in the world. Barret HE rifle is also not a military issue weapon at this point in time since it is brand new and not in mass production. And the PSG-1 is a tactical weapon, not a military one. SPAS-12 is not a military weapon.
The problem with these ideas is that they are for personal preference and not in the interests of balanced gameplay. :/ And while BF2 does put gameplay above realism, it does revolve around certain basic ideas of realism, and so some of these ideas would clash with that basis.
My suggestions:
Revert the AT kit. Four to five hits to kill a tank makes the kit all but useless.Scratch that, the kit is useless. I can do more damage to a tank with my pistol. It was hard enough when it took two hits to kill a tank, why they weakened the thing is beyond me.
Flashbangs. Either give them to every assault kit or remove them.
The should make the P90 armor piercing,for realism sake, but nobody's gonna be too bummed if they don't.
Snipers and support should be able to deploy bipods on ledges, windowsills, sandbags and other objects to increase accuracy as if they were prone.
Some more squad control is needed. Squad leaders leaving their squad should be able ot assign the new squad leader, instead of it just going to the next person on the list.
Squad leaders need a commander like map so if they need to they can take a second and assign each squad member a different task. This would help facilitate squad objectives without long typed out conversations, because not every player has a mic.