when we have a する verb, (e.g. 支度する、案内する、心配する) is it true that we could optionally insert an を particle in between the noun and the する?

Because in the example sentences at http://www.csse.monash.edu.au/~jwb/cgi-bin/wwwjdic.cgi?1MUE%E6%94%AF%E5%BA%A6 and http://www.csse.monash.edu.au/~jwb/cgi-bin/wwwjdic.cgi?1MUE%E6%A1%88%E5%86%85, we can see this usage (the usage of を particle appearing between the noun and the する)

So basically am i right to say that for all する verbs, we can optionally include (or exclude) an を particle in between the noun and the する?