I've decided to branch the Community ICE Project modeling information out of the general project thread and into a more specific thread for those that wish to contribute. Below is the short list of suggestions provided by the community in that thread. As more ideas surface, we can update this post.
Easy (from highly to less relevant)- Extrusion along curve (fast and simple)
Jump to thread- Symmetry
Jump to latest update- Merge vertices (based on threshold)
- Revolution
- Loft
- Shell (ICE version already exists in SAP so is less relevant)
Intermediate (from highly to less relevant)- Extended primitives
- Clone island (clones one or more islands of an input mesh, with option to delete the originals)
- Extrusion along curve (complex)
- Relax/smooth tool (with shape preservation?)
- Cap Holes (ICE version already exists in SAP so is less relevant)
Advanced (from highly to less relevant)- Better boolean tools (with actually good results
- De-intersect (should fix intersecting groups of polygons: think of fixing the result of a cloth simulation ran without self-collisions. this looks more like a deformer for me, but is great!)
- Retopology (based on curves?)
- Bridge Tool (Modo alike, able to twist and find nice solutions to bridge different number of edges)
I recommend if you decide to work on one of these tools, you post it here and make routine announcements on your progress (or lack thereof). That way others can "jump in" as the opportunities arise.