Hi Dave I think its possible but have never played with el-mod see here
http://www.el-mod.de/pdf/PRO_english.pdf" onclick="window.open(this.href);return false;
If you are using multi channel radio (not Heng Long )even if you cant conecet to the board you could put a Y conector from the receiver conect one to the board and one to recoil (if you fit a servo slow Tunngi thing)you could have the servo move fast back slow forward,the pdf shows conections for servos, the tamiya conection wouldnt be suitable for a normal servo because there is no reverse on a tamiya recoil its just a motor going one way.
It all depends what you have in mind there is allways a way to get it working.
regards pete