| Grindergrend |
In my opinion, the swashbukler is actually an option worth considering. Your tanking ability will be quite good at any level, you get high AC, high CMD (which is a crucial element of tanking) great saves when you need to, d10 hp and very nice parry/riposte mecanics.
You get 4+int skills per level and are proficient with many social skills which combined with high charisma get you at a reasonable level of facing (you will never match a bard though but lets face it, who does).
You get very nice casting disrupting abilities later on.
You are dex based so innitiative will be fun.
Your only issue will be damage at early levels (before level 3). If human you can pull some 1d6 + 5, with high crit chance, using slashing grace on a rapier. After level 3 you start adding your level to damage and the sun will be shining from this point (though you will not match the dps of a barbarian even then).
All in all it nets you a very survivable character with some damage potential (except at very low levels) and reasonnable facing capabilities.
Now regarding you initial question, I understand that you want something usefull to do outside of combat (not just some RP flavour, if I understand correctly, but something that will actually benefit the group). This question cannot be answered without knowing the out of combat roles that your team mates will fulfill. For example, if you have a bard in your group, my swashy suggestion is completely pointless as your bard buddy will be handling all the social stuff anyways. Same goes for the ranger survival skills if you have a druid aboard.
One option that will never fail however (it actually can fail if your DM never gives you any cash) is using two feats out of a fighter's massive pool to craft arms and armors or wondrous items (both, why not?). Even with a pretty intensive magic items crafting team, crafting delays always remain an issue and saving cash never hurts. It is not the most fancy job though, but it is definitely usefull.