is it possible to save a list of lists in the option db?

[Christian Stimming]

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In HBCI, each human user can be a customer of various banks, and for each bank 
he might have been assigned various user-ids. I would like to store this 
"list of banks containing lists of user-ids" on a per-end-user basis. This 
doesn't quite allow me to save it in a kvp_frame of each book, since a) one 
book might be used by different end-users, and b) the same end-user will want 
to access different books and still have the same functionality available.

Therefore I thought the most appropriate place would be to store that "list of 
banks containing lists of user-ids" in the options file of the end user, 
probably as an internal option. How hard is it to store a list of lists 
there? These lists will not be very big, but still an average user might have 
3 banks with 2 user-ids each, so I have to stick to the list structure. The 
user-ids have a fairly limited character set, so I could probably add control 
characters to do some parsing on my own.

Christian
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