up at the top i think in the advanced drop down menu there is something that says Gameplay Constants
bringthat up
at the top of the new window check use custome constants or something
then press H (for hero) and find something that says something about creeps and XP
the thing sHOULD look SOMETHING like this (off the top of my head here...) 80,70,60,40,0
or something
just make the 0 into something else... and add more.... one digit for each lv you want to add... if you want them to gain xp from creeps till ... lets say... lv 100 (if you have it that high) then you want to set it to have 100 digits there
hope i help =D
edit: about the green circles.... i think the only way to get rid of them is if you have the black mask enabled
you know.. where the parts you have not explored are PITCH BLACK
i had to do that on one of my maps when i did not want people to know where creeps were =D