2. My current futaba is mode 1 and i want mode 2 - would the 6exap mod wirth frsky allow that?
yes but channel locations will change.
On the Futaba you can change modes very easily. I too switched my Futaba 6ex from Mode 1 to Mode 2 myself. Channel locations DO NOT change (i.e. Ch1 Remains Aileron, Ch2 Elevator, Ch3 Throttle and Ch4 Rudder).
To change the mode:
1. Open the Tx.
2. Remove the Throttle ratchet from the Right gimbal and attach it to the left one.
3. Remove the spring from the Left gimbal and attach it to the Right gimbal.
(Tip, the spring is a little hard to reach. I wrapped a thread around the spring and pulled it off. Similarly, you can use the thread to put it back on)
4. Now, you need to change the setting in the Tx from Mode 1 to Mode 2:
To change the mode, simultaneously depress the MODE and SELECT keys, then turn on the power. The current mode will appear on the LCD screen. Push the DATA INPUT lever up or down to change the mode.
5. You're done.
Since you already have a tx, I would not suggest buying another one. I too would suggest getting the FrSky 2.4GHz Module.
You can refer to the following video as well: