You can add leagues, big or small, to Sports Club Stats.
   It's free.
   It's easy.
   Just email import@sportsclubstats.com the:
      structure
      schedule
      and rules
   In a few minutes you'll get back a link to the league.
   Play around, have fun, you won't break anything.
   I look forward to seeing what you create.

Info about the various settings:
   https://docs.google.com/document/d/1-UneDNk6tkOrc_B-WBnGnc5KGiy2kttXC2fW8dR7QzM/edit?hl=en

For example, here is what created this league:

LeagueBegin
  League:     European Rugby Challenge Cup Qualifying Competition (ERCC Qualifying) (ID: 1a1dg) (Sort: League) (Playoffs: 2)
    Division: Pool A                                                                (ID: d143f) (Sort: Pool) (Playoffs: 1)
      Team:   El Salvador                                                           (ID: t1pii)
      Team:   Heidelberger RK                                     (Heidelberger)    (ID: t1pij)
      Team:   Mogliano                                                              (ID: t1pim)
      Team:   Rovigo                                                                (ID: t1pip)
    Division: Pool B                                                                (ID: d143g) (Sort: Pool) (Playoffs: 1)
      Team:   Calvisano                                                             (ID: t1pig)
      Team:   Dendermondse RC                                     (Dendermondse)    (ID: t1pih)
      Team:   Krasny Yar Krasnoyarsk                              (Krasny Yar)      (ID: t1pik)
      Team:   Petrarca                                                              (ID: t1pin)
  Kind: pro
  Sport: rugby
  Gender: male
  Country: Europe
  State: 
  Level: C
  Season: 2016-17 (current: True)
  Author: Matt Grande
  Note: 
  LotteryNote: 
LeagueEnd

SortBegin
Pool: Points HeadToHead, GoalsDelta HeadToHead, Call League
  League: MoveClinchedToFrontBySeed, GoalsDelta, DrawLots
SortEnd

RulesBegin
  PointsForWinInRegulation:  4
  PointsForWinInOvertime:  4
  PointsForWinInShootout:  4
  PointsForLossInRegulation:  0
  PointsForLossInOvertime:  0
  PointsForLossInShootout:  0
  PointsForTie:  2
  PercentOfGamesThatEndInTie:  0.007
  PercentOfGamesThatEndInOvertimeWin:  0
  PercentOfGamesThatEndInShootoutWin:  0
  HomeFieldAdvantage:  0.59
  WeightType:  PercentOfPointsWon
  WeightExponent:  0.458
  WhatDoYouCallATie:  draw
  WhatDoYouCallLottery:  lottery
  WhatDoYouCallPromoted:  Promoted
  Promote:  0
  PromotePlus:  0
  PromotePlusPercent:  0
  WhatDoYouCallDemoted:  Relegated
  Demote:  0
  DemotePlus:  0
  DemotePlusPercent:  0
RulesEnd

GamesBegin
TeamListedFirst: home
10/15/16   Calvisano      60-19   Heidelberger   (ID: g1rpgm) (HomeBonus: 1)
10/15/16   El Salvador    57-8    Dendermondse   (ID: g1rpgn) (HomeBonus: 1)
10/15/16   Krasny Yar     48-24   Mogliano       (ID: g1rpgp) (HomeBonus: 1)
10/15/16   Petrarca       24-16   Rovigo         (ID: g1rpgq)
10/22/16   Krasny Yar     32-5    El Salvador    (ID: g1rpgr) (HomeBonus: 1)
10/22/16   Petrarca       31-22   Mogliano       (ID: g1rpgs) (HomeBonus: 1) (AwayBonus: 1)
10/22/16   Rovigo         19-22   Calvisano      (ID: g1rpgt) (HomeBonus: 1)
12/10/16   Dendermondse   7-29    Rovigo         (ID: g1rpgu) (AwayBonus: 1)
12/10/16   El Salvador    3-39    Petrarca       (ID: g1rpgv) (AwayBonus: 1)
12/10/16   Heidelberger   21-50   Krasny Yar     (ID: g1rpgw) (AwayBonus: 1)
12/10/16   Mogliano       35-26   Calvisano      (ID: g1rpgx) (HomeBonus: 1) (AwayBonus: 1)
12/17/16   Calvisano      26-19   El Salvador    (ID: g1rpgy)
12/17/16   Heidelberger   7-55    Petrarca       (ID: g1rpgz) (AwayBonus: 1)
12/17/16   Mogliano       48-17   Dendermondse   (ID: g1rph0) (HomeBonus: 1)
12/17/16   Rovigo         11-47   Krasny Yar     (ID: g1rph1) (AwayBonus: 1)
1/14/17    Dendermondse   16-33   Heidelberger   (ID: g1rph2)
GamesEnd