setting time ranges for statistics討論

I know this was suggested in another post - but it is very important for me. I need the possibility to limit my history to a certain time range for stastic purposes only. Sometimes I change some parameters of my trading setup in order to get higher profits or lower donw the risk... - and after this change it is very interesting for me to examine the timerange AFTER this changes or the timerange BEFORE. So I need the possibility to define my personal history timerange for investigation.

use custom analysis? select timeframe (1d,1w,1m,6m,1y,all) or specify start date and end date