some Dn4 Ability on stock 4.4.2 topic

hi i think a stock rom is faster than custom roms but
first:

how can i use screen mirroring on roted stocked roms on note2 GT n7100 ??

second:

can i install a mod for showing which availabel network is 3G and which one is 2G look like dn4 rom???

these 2 is so important to me so please help me :o