Blaster fire has spread that rails don't so when fighting at range lots of blaster shots miss. That said the ROF and damage on blasters is so good that it doesn't madder. If your fighting at the ranges that a rail would have the advantage then your far enough away that getting to tank sized cover is easy. Even if you use small turrets blasters are still better because of how easily your aim is fouled by the movement of the vehicle its attached to. This is on top of the fact that rails are just plain harder to use because of the windup time.

Feedback:

Railgun continues to fire after I've released the R1 button if I'd hold R1 for a longer than a few seconds before releasing it. It should have stop firing after I release R1.

The first part of what you said i will buy, however the last part of what you side is not true. I am not sure if you are a tank driver or what, sounds like you are not. You say "If your fighting at the ranges that a rail would have the advantage then your far enough away that getting to tank sized cover is easy" but this is so far from the truth. In my railgun fitted tank i can kill you in two shots if you are in a t1 tank and 3 in a t2 tank. if you are at a stand still I hit you once, at this point you start moving, even with a tank it takes about 6 seconds to get up to speed to be able to move anywhere, so unless you are already right beside cover which in most maps in the open areas there is very little cover, then i have already killed you. getting to cover takes alot longer then one would think, all I need is 9 seconds to kill you in a rail gun fit tank, 9 seconds sounds long but it really is not because most of the time the rail gun will get the first shot off so really you only have 6 seconds to react (aka decide to run and/or engage mind you most will try to find the attacker) and then move. Again by the time this thought process is over you are dead.