[QUOTE=H0RSE;348744]Instead of adding more abilities, they could implement the option to put more than 1 point into abilities, which would make them more effective. That would be “ability specialization.”
Just for fun, here are some abilities I thought up a long time back (like a year before release).
SOLDIER:
Sticky Grenade - Throw grenades that stick to surfaces, and players.
Improved Resupply - Your ammo kits give more ammo
Double Whammy - Throw 2 grenades instead of one, every time you throw a grenade. Each grenade does less damage than a standard grenade.
Grenadier - You have double the amount of grenades
Explosives Expert - You take less time to arm your charges
ENGINEER:
Grease Monkey - Building and repair time are decreased
Turrets Syndrome - Your turrets have more health and do more damage, but cost more energy to build.
Increased Mines - You have double the amount of landmines.
Turret Sentry - When your turrets detect enemies, their position will be revealed on the minimap.
Firewall - Your turrets cannot be hacked, but deal less damage and cost less energy to deploy - Quantity over Quality.
MEDIC:
Adrenaline Boost - Allies that you revive will gain a boost of speed for 3 seconds.
Epidemic - Allies that are healed by your medkits gain a small health regen ability that will affect any nearby teammates for 5 seconds.
Second Wind - You have a self-revive skill with a long cooldown rate.
Overheal - Your medkits heal for 120%, but cost more to use.
Transfusion - You can convert supply points into health, and vice-versa.
OPERATIVE:
Saboteur - Can hack turrets to turn against their allies
Quick-change - Disguising time decreased
Hacker - Hacking times decreased
Cross-Examine - Every time you interrogate the same player, the amount of information he reveals will be increased.
Feign Death - Appear dead to enemy players, in hopes that they ignore you.
GENERAL:
Cyanide Capsule - After you are incapacitated, you have the option to swallow a pill and kill yourself, making it impossible for Operatives to interrogate you or steal your disguise.
Fast Hands - Increase reload speed with all guns
Heavy Hitter - Melee attacks deal more damage
Idiot Savant - Killing grants less xp, but everything else grants more.
Last Stand - The more damage you take, the more damage you deal.[/QUOTE]
Cool stuff. I don’t see why such stuff can be added over time. The game has a great sandbox potential. Just keep raising the lvl cap adding new abilities as time goes on. Even if not, still good ideas. 
