Restrict skills in ESS

Hi,

I have a requirement where in ESS learning page -> skills profile i want the user to be able to select only one skill.

We thought of disabling the "add new skill button" in portal but that would need logic to be written incase of a user without a skill or if a user deletes a skill.

Can this be done in any other way??

Can this be done in config or Is there any BADi or exit for this???

Regards,

Zubair