Freeform commander is not fully implemented (different deck size)?

[From reddit](https://www.reddit.com/r/XMage/comments/88pr99/is_there_a_way_to_play_a_variant_of_commander/) about current freeform commander restrictions:

> I would like to try play-testing **Giant Leaders**, **EDH69** and all those other kind of sub-variants of EDH but the **restriction on deck size on the freeform commander forbid the use of most of those. normal freeform doesn't have you start with the general in the command zone and other rules that apply only on EDH**.
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> I can do some coding to change the things I know that are different from the base EDH to the sub-variants but I don't really know how to add those changes as "addons" so they won't interfere with the base game. also a guide for such a thing(making sub-variants as "addons") will make it so that ppl who want to make a new version of the game themself can prototype it in an environment that has rule enforcement so they won't need to worry about how the cards behave when they test it.
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> it's not really that relevant to the players in the game, just something I thought would be fun to try. and the fact that there are over 10 common variants of EDH, and others that are just played by a small group of friends among themselves - there is no reason at all to include every variation of the format. but if there is a way to allow their use, why not do it?
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