You can make a 1 pattern Ring tone loop. You need to set the loop value of the pattern. If your program can't do this you probably won't be able to then. For instance :
000 Pattern Header ID
00 Pattern ID
0010 <---------Loop Value, will play the loop 2 more times (3 total)
this needs to be programmed when the ringtone is in binary, before Hex.
Hope that helps