The version you are using happens to be that of the EDGE tier. I wouldn't normally recommend using EDGE on a production machine.
I do confirm that 11.28.87-STABLE_51188 does work to show the edit link in WHM > List Accounts > Username column when List Accounts and Account Modification are both enabled for a reseller in WHM > Reseller Center > Edit Privileges/Nameservers area, while 11.29.0.13 does not show the edit link in WHM > List Accounts > Username column for a reseller with the same privilges. I am going to be opening up an internal case about this occurring. I will post the case ID number after that has been completed.
Thank you for bringing this to our attention.