Thanks for the feedback.

I personally don't think any SEO Question is Naive, there are so many permutations and possibilities. And if you work with a large company and Large Dev Teams with Legacy Systems you are often put in scenarios that little questions like this are important and can dictate how entire scope may or may not be realised. I am compiling a comprehensive URL guidelines for my Devs (which I will certainly share with the SEOmoz community when complete.)

A little sideline note: Someone once told me Pipe Characters "|" won't impact a URL string. However, they actually frequently break, get truncated or double encoded  when being crawled from Google/Bing with little rhyme or reason.

The question about Brackets/Braces Stemmed from this link from Coke.  http://www.cokeunleashed.com.au/wagsallowance.jsp?mkwid={ifsearch:s}{ifcontent:c}WVnyieg7&pcrid=13521527730

Even if they use a nofollow attribute - They are certainly counted as a citation and verification source for local SEO while additionally. The Nofollow vs follow theory is difficult for large directory sites as they have a double edge sword. If they followed every link - then they become spam, if they follow only paid listings then they become a paid link network, so if they no follow everyone they protect Authority and Google/Bing can utilize them as an authority reference point.  That being said your website is likely to be crawled more frequently just being on a local directory.