It works with unlimited steam id's. But you configured it wrong.
Quote:
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;STEAM_...... v_old_model v_new_model p_new_model w_new_model
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After the identifier(team/steamid/etc) you have to ALWAYS put the old v_model, no matter what you will replace and after that keep the sequence: v p w
If you don't want to replace one of them, then use NULL.
The correct line would be:
Code:
STEAM_0:0:54369xx models/v_knife.mdl models/nw/v_knife.mdl models/nw/p_knife.mdl NULL
Also, check your error logs. In most of cases plugin will tell you why a resource was not replaced.