Hi Matt
I also have the LP5DSM radio that came with my Blade CX2 Heli it is pretty limited but I think you can make it work.
This is what Horizon has to say about it:
"Will the LP5DSM E-flite Blade CX2/CX3 transmitter work with the Sukhoi?
The LP5DSM transmitter that is included with Ready-to-Fly Blade CX2 and CX3 helicopters is compatible, but does not include dual rates for optimum performance of the Ultra-Micro Sukhoi Su-26m and is therefore not recommended."
If you look at the manual for the CX-2 Heli at Horizon and go to page 38 - It tells you how to bind Basically insert bind plug, power up receiver, power up Tx, wait for solid LED light.
It will also be important to set the DIP switches under the panel on the front lower left I beleive these are their functions (2nd hand info from another forum - I would credit the original poster but did not save info

)
1 - HELI/AIR Default "ON"
2 - NORM/CCPM Default "OFF" COOL!
3 - ELE+RUD Default "OFF" (V-tail mixing?)
4 - ELE+AIL Default "OFF" (Elevon mixing?)
5 - THR REVERSE Default "OFF" (Throttle Reverse)
6 - AIL REVERSE Default "ON"
7 - ELE REVERSE Default "ON"
8 - RUD REVERSE Default "OFF"
9 - Gyro/Ger Default "OFF" Maybe "Gyro/Gear" ?
10 - AUX Default "OFF"
I have no idea if this is correct or not - but it might be a startting point.
Especially switches 1 Aero/Heli Mode and 5-8 for servo reversing.
Maybe someone who has actually used the LP5DSM will chime in this is best I have to offer.
Mark