WHBM:
You might (or might not) be interested to know that I spent some time in the BAe146 simulator at Hatfield in 1992 with the FAA looking at the possibility of making 7 degree approaches into London City (also Aspen, Colorado and Casper, Wyoming).
We successfully proved that a 7 degree slope was only just possible if absolutely everything was done in a perfect fashion and there was absolutely no room for error. In order to cater for an average crew in an average aircraft on an average day, 5.5 degrees was eventually decided upon by those in power.
I would much rather operate into LCY than FRZ any day but that is a personal opinion of course.