I vote no.
- I think it would cause confusion for the normal prp user.
- It only takes ~10 P4 2.4 GHz to keep up with prp at the moment
- It is as Louie also mentioned somewhere not something that the average user would engage into, it requires some looking after and involves quite a few diffrent operations.
Insted I think a seperate page like www.seventeenorbust.com/sieve and Mikes sieve page with an explanation how to factor would be a good thing, but for me it's not a priority since I think we almost have enough factorers at present.