Yes and no.
Captcha has been compromised , so some sites that include it as a forum feature to enable have had issues with it. If it's an automatic installation bit, chances are you'll have more issues than someone who does their own implementation of it. The reason behind that is the automatic or plug in ones have the source code sitting out there free to use and view - so you code around it. Whereas if you implement your unique way of doing it, the source code is unavailable for exploit - meaning that there needs to be a human involved - and spammers generally prefer to infect many sites, rather than stumble across one unique set up and make an effort (course that also depends on the site and traffic - big busy sites are worth the effort, small sites like my own aren't).

What's happening is that there's a script out there that can tag SMF forums and add accounts without human intervention. I ran into a similar problem a few years back with my Snitz forum - but easily defeated the scripts with simply adding a textbox to the member add page that expected a value of 123 - On the page before it (the I agree page) I added a label saying "REMEMBER THE SECRET CODE IS 123 , YOU HAVE TO ADD THAT TO GET AN ACCOUNT!).

I went from hundreds of spam accounts to none.

Sure!

No problem, altho it was pretty strange his pin number was the exact same one that I use for my luggage.

Same here.  But Dina guessed I was female!  She's one of the only ones ever to do so.  *gives cookie* 

I am guessing you're a female.

//holds paw out for cookie

Pssst....I think ED is a bot in human clothing.

I am a lemming. Mostly Harmless.

The meek shall inherit the earth (no matter how many throats I have to gnaw thru).

Yes to the import - there's an option on the file menu.  I haven't had a problem with anything in Firefox, and it's all I use at home.  Very occasionally something won't load and I use Chrome instead, but I can't even remember for which sites.

I know you can turn Adblock off for specific sites on the fly  (just click the icon you get in the corner of the browser)...maybe not loading flash would be the same?

Flashblock allows for turning flash on and off as needed.

Some people do.