This absolutely depends on the NAV version you use!
For example, with older NAV versions (pre Dynamic Cursor) the "SQLIndex" property (used correctly!) could help, with all newer NAV versions actually using it could screw up your system.
When it's about SIFT/VSift, this might be helpful: http://dynamicsuser.net/blogs/stryk/archive/2010/05/29/optimizing-sift-and-vsift.aspx
If you are not sure about how to handle these "Key" options, then just leave them as they are ...
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BTW: it is MaintainSIFTIndex not MaintainsSIFTIndex
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For example, with older NAV versions (pre Dynamic Cursor) the "SQLIndex" property (used correctly!) could help, with all newer NAV versions actually using it could screw up your system.
When it's about SIFT/VSift, this might be helpful:
http://dynamicsuser.net/blogs/stryk/archive/2010/05/29/optimizing-sift-and-vsift.aspx
If you are not sure about how to handle these "Key" options, then just leave them as they are ...
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The versions i´m talking are NAV 5.0 SP1 and NAV 2009.