my 2cents...
i assume when we discuss with USCIS we cannot ask for things like AC21 with no restrictions, count 5 year eligibility for citizenship from the 485 filing, etc, as my impression is that these are in the hands of the lawmakers and not with uscis. with this in mind these are my thoughts:
-issue EAD, AP for 4 years (or more???). this will eleiminate a lot of applications and will aid them to spend more time with other applications.
-improve customer support. eliminate this useless 800 number and provide direct case status, or very good detailed status on the website.
-show some regularity in the approvals (i.e., approvals should be in chronological order, no random approvals). say, approvals should not overlap by more than 3 months, i.e., no more things like when people from 2001 (btw, i am not a 2001 filer) are waiting people from 2002 getting approved. i am sure people will disagree with me on this, but there should be some sort of first in first out system. i understand there cannot be strict chronological order, thats why i am saying 3 months window.
-issue FP in order. same issue as the approval of 485. only one FP and it should remain valid through the pendency of the 485.
-the transfers to local center should be processed with at the local center fast. it doesn't take more than 30 mins for an interview.
i hope the above are within the power of uscis. if i think of anything else i'll post. i hope these are reasonable too.
ofcourse the best thing if they approve the gc, we don't need any of these. so if they say - all 485 will be approved by default after 1 year of filing it would be great :-).
I-485 (TSC): PD 05/2001, RD/ND 11/2002, FP 10/2004, AD/PS/CO/CR 11/2004.
N-400 (TSC, Atlanta GA): PD/RD aug/12/2009, FP sep/08/2009, ID/OD/USC dec/02/2009.