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Reserved Ports

I know this is not a SQL Server related question but I hope somebody can help anyway.
Windows Server 2003
2 node cluster
SQL Server 2K sp3a
and finally (last week) Domino Server 6.5.3 and here comes the problem: We have a problem with Reserved Ports and on the Internet I found this: "The cluster service is installed by default as a part of Windows 2003 and
therefore has the registry configured to protect it´s default port 3343.
When Domino Server is installed it overwrites the registry key for the
cluster service with it´s own port, thereby breaking the cluster service. The workaround is to delete the following registry key: HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesTcpipParametersReservedPorts and then recreat the registry key as a REG_MULTI_SZ value and include
3343-3343 and 1352-1352 as the values." In fact we no more have the registry key with the value of 3343 but only a
key with the value of 1352. 2 Questions: What can happen if we do not change this value?
Is it correct to modifiy the registry keys to there original value? Please advise.
Domino overwrites the key instead of updating it. Do as the article suggest and include both cluster services ports and the domino ports in the key.