I suggest to make the Identd fields using unlimited chars.. because, in actual moment, many ZNC providers suggest to include in Identd the network used (in case of multiple networks support), so the id for ZNC must be, for example: klez\Undernet
That is a problem because, as mentioned in my above post, the ten character limit is there for a good reason. Before this limit was put in place, many users used to report connection issues due to long userids and/or userids containing characters rejected by IRC servers.
If I remove the limit, including the limit on the types of characters (since you want to use the \ character), we will return to users experiencing connection issues.
The only other option would be to add a cryptic option in the identd dialog, such as "Fix invalid userids", enabled by default. Users who need to use invalid userids would be able to disable this. However, it would affect their userids for all connections.
