Okay.. just my 2 cents...I think a few tools here and there are fine - both of you should be represented. But it's only okay in moderation. DF has had several friends who have gotten married recently and (IMO) have had the WORST registery lists ever.
There was one registery where all that was listed were things like extension cords, plungers, garbage bags, and other completely non-wedding-y strange things. I found it tacky - it felt like they were expecting their wedding guests to do their "necessity" shopping for them. This was the hardest wedding I've ever had to buy for and we acctually ended up just giving a gc, because I couldn't justify buying a plunger as a wedding gift
I think if you're keep in mind that these are
gifts, then I think you should put whatever you want on them.
Happy registry building!