The pegmode 1 will randomly put anglers in a peg, I think you want pegmode 0 to force a peg for all anglers to use, it's been a while since I ran a server and have not tested this but I extracted that from the help file.
'If this value is set to 1 then the server will only set the venue ( see later ) and allocate out pegs on that venue at random to arriving anglers.'
If this is set to a value of 0 then the server will give all anglers connected the same venue and peg to fish.
Source: 'fsserv' HTML Help file in the FS2 folder
Hope that helps you out,