Do you have .NET Framework 4.0 or 4.5 installed? You can check it in Control Panel -> Add/Remove Programs or by going to "C:\Windows\Microsoft.NET\Framework" and checking if there is a folder like "v4.0.xxxxx".
You able to add a field that has you to record deaths in a run. So you have an idea of how your exp for that particular run is messed up or for you to track how many deaths you have had total in a run or paragon level?
you can make a combo box on top of statistics from which ppl will choose if it's either "gold statistics", "experience statistics", "legendary statistics", "elitepacks killed statistics", "Demonic essences statistics"(from 1.0.7)
for input you can add a couple of check boxes on the left which will expand these sections (and only these that are checked will appear on combo box list in statistics section)
also calculating XP gain w/o applying XP bonuses from gear would lead to more accurate estimation of item farm efficiency - make it optional by filling "XP item bonus" box in input section
some ppl would also like looking at so called "data.txt" file directly to check their progress (if XP/h of each run was there), so adding chart (.NET chart control) AND/OR saving all data into .xls/.ods database-like spreadsheet instead of .txt file would be much better and easier to handle on the larger scale (with all these input data from idea above)
also regarding chart you could store a string that represents a run, for example "Alkaizer Run" or "Big6 Run" and then make each of them have their own colour on chart
similar to this (i didnt manage to add colour for each label though):
that's all from the ideas i gathered for 1.0.3 that are still not implemented yet, hope u'll make a good use of 'em !
Saving to .ods isn't implemented yet since it might take really long time to do it right so I need to rethink it and maybe find better way to do it. Will see.
*Added gold statistics
*Improved statistics' window
*Moved some optiosn to "More" menu button
*Rewrote profile saving (now it uses internal profile settings file instead of creating file in program's folder)
*Added some KeyBinds ( Shift+F - Add Legendary, Shift+S - Start Timer, Shift+D - Pause Timer, F1 - Help) - program must have focus (I didin't want to do any low-level keyboard hooks to make it work in background)
I've found some unintended behaviour(i guess): when you check "Compact" and then "Statistics", the input area renders empty - it would be better to disable compact mode while viewing statistics but returning to it properly after unchecking "Statistics", just making "Compact" gray or something while displaying stats, it makes no sense displaying so much empty space if you can fill it
btw: having other things being calculated as well makes XP calculation not mandatory, imagine 100 paragon character that's interested only in calculating their Legendaries/h (some moldran, kingkongor or any other maxed out farmer), also if you could get their attention it would bring you a flood of feedback from their communities ^ ^
ah and this 1.0.7 patch will make ppl want to pick up rares once again just to salvage that utter garbage for crafting materials, therefore they will try to achieve best correlation between standard farming efficiency and rare count, worth adding
* Experience checkbox - You can disable leveling calculations and just count gold/legendaries or w/e you want
* Fixed some minor bugs
* Added Demonic Essences counter
* Added Elites killed counter