We have dispersion on every gun except the man-ack and tankguns. Why?
Well for my part the man-ack could stay as it is, ROF makes it difficult to hit with already.
But tank guns hitting the very same spot at 2000yds... ? 
Look at the Tiger's gun:
 Accuracy:
Gun    88 mm KwK 36 L/56
Ammunition    Pzgr. 39    Pzgr. 40    Gr.39 HL
Range           
500 m               100 (100)    100 (100)    100 (98)
1000 m              100 (93)    99 (80)    94 (62)
1500 m              98 (74)    89 (52)    72 (34)
2000 m              87 (50)    71 (31)    52 (20)
2500 m              71 (31)    55 (19)     
3000 m              53 (19)          
Source : JENTZ, Thomas L.; Germany's TIGER Tanks - Tiger I and II: Combat
Non bracketed values show the probability in % to hit a tank sized target under controlled conditions, that means it is the ability of the gun+ammunition itself.
The bracketed numbers show the average hit probability in % by an average, calm gunner when the range is known.
Looking at the 2000m column, one sees the gun+ammo for example 39 (most common AP) has a 87% chance of hitting a tank due to dispersion! In other words, it has a dispersion characteristic of roughly 3,8x3,8 meters (~4x4 yds) at 2000m.
Any chance of seeing that in a future version? 
Regards,
Matt