สวัสดีครับ ผมก็มีปัณหาอย่างงี้เหมือนกันครับ
I'm having the same issue, though not in Captivate. Rather, I'm making a video in Premiere and want to put Thai subtitles over parts that are in English, but I have problems with words like ซื้อ where the two symbols above the main line occupy the same location. Meaning you can' read it properly.
I know that we are using different programs but hopefully this can be resolved in a similar fashion in both programs. I've searched around on the internet and this seemed to be the closest discussion to the problem that I am having.