Hi,
In the coming expansion, I had an idea for 2 additional feat (hoarding feats), perhaps as Veteran Feats.
Ancient Pack Rathound feat (or whatever you want to call it), prerequisite the regular Pack Rathound feat, and further increases carry capacity. (for example by 60 or something like that.)
a more "fun" feat could be a:
"Al Fabet" feat.
currently the encumbrance limits are:
Heavily Encumbered 35 points over carry capacity
Completely Encumbered 70 points over carry capacity
the feat could simply double (or triple) those numbers.
Since it is simple Hoarder Feats, they wouldnt break the game balance in any major way, and I guess they would be somewhat simple to implement.