Electronic – N Mosfet with 8 pinout

You don't need to "amplify the current". It will flow automagically when you switch the LEDs on. The thing is that you need a switch (MOSFET or BJT) which can stand the 2A.
A power MOSFET would be ideal, since they're available with very low \$R_{DS}(on)\$, so they won't get very hot. You can do a parametric search on this Fairchild page. For example the FDN339AN and FDN359BN have low \$R_{DS}(on)\$.
An other option is to use a darlington transistor. They're not ideal though: \$V_{CEsat}\$ is rather high, often 2V, so when you run 2A through them you need some cooling.

Per Stevenh's recommendation, I am placing my comment as an answer and extending it.

Could be desired compatibility with a competing chip.. I used be in Semi and we have done this all the time. The idea was to offer a pin drop out and under cut them to get the biz. Wirebond is a sturdy piece of technology and last I checked people are moving to copper from gold. Most of the chips are tested at 50g drop tests, I don't remember us failing them at all.(BTW, these tests are never ever mentioned or released unless you are a serious customer due to hassle of answering questions)

In terms of signaling crossing wires is generally a no no, however don't assume there is a single pad for that pin. Depending on the marketing input, I remember we made several bond out options where we use different pads for the same functionality.