Word spacing control shortcut / script

Hi,

Currently I am working on project where I have an arabic text flowing in its separate frame. Every sentence is ending with a number in a circle. Marked with red in attachement.

In the green box below the arabic, is its translation in Urdu. It is also in its separate frame. In Urdu also every sentence is ending with a number in circle. Marked with Blue square (1st one).

My job is to match the end numbers of urdu translation. I am achieving this by selection the urdu translation inside the green box and using Ctrl+Alt+\ to increase the word space. I am also using  Alt+ right or left arrow to increase and decrease the tracking. It is working but its too slow. 

Is there a way to control Ctrl+Alt+\  ? I could not find any place to increase its threshold. In fact, its an undocument command. It just increases the word space. Can a script do this or change the threshold of the word space ?

Thanks