>But aren't they only created by EAC for CDs containing audio tracks?
sure, EAC is useless for data track images only
>How do I get them for CDs with only a data track?
If you wanna use IsoBuster, then do right click on "CD" -> "Extract CD <image>" and after extraction it will ask you for CUE creation, or you can look for DATA TYPE in: Track01 -> Properties -> Advanced -> there you will see Mode1 or Mode2
>and got different gaps for every drive and extraction mode!
- Gap detection Method A only, nothing else, other methods are in most cases inaccurate !!!
- Detection accuracy: secure, before gap detection set drive read speed to slowest speed !!!