I'm new to fitsync, so it's possible these exist and I just haven't found them yet, but after explorig it the past few days, here's some things I think could help....
Bodymap (nice feature)
1) more narrow temporal views (i.e. within 1 month or 3 months)
2) editability of what is tracked (i'm thinking the user could lable it and choose data type and range). I don't do girth measurements often (it's been yrs), my scale
gives me body fat, visceral fat and lean mass %'s, only one of which can currently be put in (I've just been putting them in notes so they are at least trackable in some way)
3) ability to add old entries, seems I can only add the present day. If I forget to add until the next day I'm out of luck. If I want to add older dates, again out of luck
Exercises and reports
1) very nice overall. Would like to be able to assign exercises to multiple categories. This would make it both easier to find exercises (may fit into 2 or more body parts and currently only be categorized under one) and ... (cont'd in #2)
2) allow the user to toggle between body parts within the workout setup if an exercise fits into more than one. i.e. I may do rows for back and shoulder and I 'd want to count it towards whichever workout I'm doing at that time (would change input to the muscle group overview graph).
3) be able to toggle either within the workout, or the exercise itself, whether there is 1 or 2 sources of resistance. What I mean by that is if I perform bench with a barbell and I bench 3x12x200lbs that would be 7200 lbs when the volume is calculated. If I did by comparison db bench 3x12x100 I'd be using 100 in each hand and it should be 7200, but will calculate as 3600 currently unless you double the reps or the weight and both can be misleading when looking back at your workouts. I'm thinking putting a default togle in the exercise would be nice, but it's probably more important to have it within the workout for those who have options at their gym. saves from having to create a while new exercise.
4) be able to toggle what the graph of exercise by muscle group overview graph chart measures. Currently it's reps (which due to the above issue is off because I doubled my reps for db and 2 handed cable exercises). I'd be more interested in volume by body part, others may want just the weight.
5) First I'm going to say that I think this would be best solved by adding a 'notes' box to the start and/or end of the workout and possibly after each session for within the workout... I'd like to be able to record things like rest periods, supersets, RPE, etc. could come up with complicated features for each, but I think a simple notes box would suffice for most of us
6) could be a part of #5, but since we have the strengh vs cardio graph, why not record the total time spent on your lifting workout so you can have a more meaningful time vs time spent as opposed to the existing reps vs time graph which is like comparing apples and oranges. Not sure how best to compared the workload.... maybe lifting volume, by cardio volume (defined as something along the lines of distance traveled x bodyweight, and somehow factoring in calories burned to take into account speed and incline which don't affect the first two variables. There may be an existing measurement unit, but I'm not aware of anything.)
7) being able to add a note to the schedule i.e. "workout missed due to vacation, or illness" or "start of new program" or whatever else is important to the user

being able to graph data by workout and body part volume over time as opposed to just individual exercises. easier to read than the existing chart and may provide more meaningful data for some users.
also a question. Every now and then instead of lifting, I'll do 10-20 minute abs or something. Any ideas for the best way to input that into the workout log that will minimize difference in volume between this type of exercise and lifting? maybe as cardio since it's nonstop?