Q:

Add multiple member - score values not supported in Redis Booksleeve

I'm trying to store multiple member-score values using Redis Booksleeve but the Booksleeve api doesn't seem to support this functionality. 
conn. SortedSets. Add overload supports only single pairs of value - scores. 
Do i miss something or this is on purpose or something that you forgot to implement? 
Currently i'm updating my sorted set in a transaction loop like this:
foreach (ForumMessage message in messages)
{
    trans. SortedSets. Add(db, redisKey, message.id. ToString(), message.id);
}
trans. Execute();

Is the above the same as doing a ZADD with multiple member-score values from performance perspective? 

A:

It won't be quite as efficient:

it'll send the command and key multiple times
there is a good chance of emptying the output buffer repeatedly, which can cause packet fragmentation

But... it'll still be pretty fast. 
There are hacky ways around the latter, including:

batching
suspend/resume flush (be very careful to use try/finally if you do this!) 

However, you might want to know that StackExchange. Redis has a multi key/value SortedSetAdd method that does exactly what you want.