CRM feature request : possibility to add custom user field in Meetings/Activities

CRM feature request : possibility to add custom user field in Meetings/Activities

Hello,

We have this request that has been transmitted by multiple clients.

In CRM / Activities / and more specifically on Meetings, we cannot add User type fields.

Use case : The meeting is planned by a presales person for the sales representative, but the presales person needs to be traced in connexion to the meeting planned/done/cancelled/result.
The option to use a list field is not practical especially for clients with a high number of users (difficult maintenance).
Some of our clients are adding the presales person to the participants list in order to be able to generate reports based on this, but this is not ideal either. 

So the feature request is: possibility to add fields of type "user lookup" on Meetings and other Activities.