Create a shortcut ("copy" then "paste shortcut") to the a2dp.exe file (which will be in the "Teksoft" folder in "Program Files") on your device. Copy the a2dp.lnk (that's LNK not INK) shortcut file to your computer and open it in notepad. Should look similar to this:
then just add your "switches":
45#"\Program Files\Teksoft\A2DPToggle\A2DP.exe" -bluetooth:1 -a2dp:1
I've attached a sample .lnk file to this post which will only work if you have installed A2DP Toggle to your device memory, not SD - but it's easy enough to edit it if you have installed it to SD.