For me , as a loner - it would be only pain in ass trait. Better would be one which would have adv in PvE and disadv in PvP - that would help much more. In other way loner would give + for healing yourself, + for giving outdoors to yourself but would not heal much other and do not travel well with Players (not counting dogs

) or slaves/mercs. That would be more usable than some alter trait.