SAP connexion using alias

Dear SAP experts,

I've got a question regarding the usage of alias for SAP connexion.

Indeed we have seen that we can easily map a partner in SU01 with an alias.

However this alias is a CHAR40 format. The alias wanted might be more than 40CHAR.

Is there any standard possibility to use a longer alias to be mapped with SU01 user?

Thanks a lot for your help, 

Regards,

Anaïs