I often trip myself up by using semi-colons instead of commas when 
entering multi-item nosy lists in the web interface -- a muscle 
memory imposed by our use of Outlook for email, which insists on 
semi-colons to separate multiple email 
recipients.

Allowing both semi-colons and commas as 
separators -- and transparently converting semi-colons to commas 
on input -- would be kinder to Windows-based idiots like me.

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The only problem with this is that currently the comma-separated list 
is standard across all three user interfaces. The mail gateway 
specicially uses semicolons for separating arguments in its extended 
subject line syntax (ie. [assignedto=richard; status=open]) 
 
I worry that it might be confusing and that people would attempt to 
use semicolons in the subject line where they mean to use commas...  
 

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Ah, OK -- I hadn't realised that semi-colons already had meaning in the 
email interface. I'll have a read of its documentation before making any 
more web-interface suggestions. (We don't run the email interface so I'm 
not familiar with it; getting it up and running is on my to-do list.)

I 
seem to have got into the comma habit now anyway...