I would love to see this too! I think this was requested in the first or second thread for this sheet, but was forgotten after bugs and other features took priority.
Something like what the official Pathfinder sheet has would be awesome. Not only did it have all the conditions built in, you could add custom buffs/conditions as repeating items that could be toggled on/off. And all of it accounted for modifier types to handle what modifiers stacked or not.
I set up custom attributes to handle conditions and spell buffs in my sheets a while back including math for handling stacking, like these notes for Acrobatics
**MODIFIERS:** [[(@{heroism_statbo} - {@{clumsy_statpen},@{frightened_statpen},@{fascinated_statpen},@{sickened_statpen} }k1)]]
or this modifier directly in an attack roll
({@{inspcrg_statbo},@{bless_statbo},@{heroism_statbo} }k1 - {@{enfeebled_statpen},@{frightened_statpen},@{sickened_statpen},@{bane_statpen} }k1)[STAT] + (@{aid_circbo} - {@{aid_circpen},@{prone_circpen} }k1)[CIRC]
and it works well enough right now, but having all of this built into the sheet would be enormously convenient!