Eu encontrei a resposta aqui
Fix for every installation so far -- I see mostly people using linux as the client so in this scenario I'm using Windows 7 as the server and fedora 12 as the client.
On the client:
tail -f /var/log/messages
now scroll as slow as possible and take note of the errors streaming in.
Example:
Feb 1 18:32:45 localhost Synergy+ 1.3.4: 2010-02-01T18:32:45 WARNING: Wheel scroll delta (28) smaller than threshold (120)#012#011CXWindowsScreen.cpp,858
This is pretty self-explanatory. Take note of the delta. For this setup, when I scroll slow, I get 28.
So now run this on the client:
killall synergyc; sleep 1; synergyc --yscroll <lowest delta> <ip of server>
Literal example:
killall synergyc; sleep 1; synergyc --yscroll 28 10.0.0.1
Make sure to go through any session files or setting you created to include your new yscroll function.
And don't use 0 or 1 (unless your delta is 1). 0 created some odd issues. You want to set yscroll to your lowest possible literal delta. 0 or 1 neither accurate nor efficient.