Trades (2x2 needed)
I think the option to trade 2 player for 2 should be available because of 2 main reasons:
1.- When a trade is started for 2 LCSplayers of the same role is very hard to achieve an agreement because usually is pretty clear which one is doing better a few weeks in the season; so the possibility to trade 2x2 would allow each team to compensate trading away a better player in one role and and getting a better one for a different one.
2.- When seeking a with a different role (i.e. a Mid x a ADC), despite mby U offer a LCSplayer of the same "value" for both teams, they may end with either 3 LCS-Ps of the same role or None if U are interested in trading away wour only Top. Allowing 2x2 would allow to ask/get the role U missing from the rival and make more fair trades.
(Sry for my English, not even sure im explaining properly what i meant ;P)