I believe it would be beneficial to allow tags, fields, threatened (status), and description choice(s) for populating projects. I am suggesting expanding the Collection Project filters to include choices that exist in Observation searches.
Users wishing to participate in a particular Project could also add specific known qualifiers such as a tag to an observation. This would cause that observation to be included in the Project as long as other filters (or none) are met.
Pre-existing noted factors such as leucistic, albino, infected, parasite, injured, marine, seaweed, UV, net, rust, gall, red, blue, banded, radio collar, unusual, cryptobiotic/cryptogamic and etc. could be used to build a Collection Project. As well, with this feature build in “and / or / excluding”.