Currently, you can either disable spam tools for all users (guests and logged in) or disable them for admins and moderators…
The upcoming 3.0 version will give you much greater control over who uses and who does not use the spam tools…
I am a bit confused over what you want to search… do you only want to search WP users? Cant you install that plugin in use it?
If you want that plugin to search the SF content, it wont do it… SF uses its own tables and that plugin doesnt know about it. The SF post data is not stored as a WP page and is thus dynamically generated from its own tables…
If you are saying you want to add a search users button to the SF page to have SF search through users, you will have several options to do that in v3.0
we are investigating to see if we can create a few generic buttons/links that can be made available for admins to do what they want with them. If it makes it in 3.0, it may be able to accomplish this
Almost every rendering function in 3.0 will be pluggable… want to add your own features? just plug your own function (such as this search users) in there…
And lastly, if I have been too long winded and you are simply looking for a way to search forum user from within SF, we can put it on the wish list as we have several other search items on that list…