Rules Patch: Loose Formation & Unit Splitting v8.3

Skirmisher movement in 8th edition changed significantly, in that it lost full 360degree facing and loose arrangement of models, into always having defined ranks and files, and reforming like Fast Cavalry. It limits how Skirmishers can move through narrow, tricky and impassable terrain features, and makes it impossible to explore battlefield terrain to the fullest (as large spaces are always requires to move units through).
Expanding this idea further, it would stand to reason that normal units, particularly small in number, could also spread out and move into narrow terrain (perfect for urban and jungle fights). This could have great value for smaller point games, making such units viable. This idea indeed was explored before in 'The General's Compendium' and the 'Lustria' campaign book.
I present here a revised version of loose formation and skirmisher movement, along with a new reform maneouver: Unit Splitting.

PROBLEM: units always move in ranks and files, even small units who could conceivably move much looser than the rules allow. The only exception to this are Skirmishers and to a degree Fast Cavalry. 
SOLUTION: Units can reform into a Loose Formation, and Skirmishers also follow these rules

  A unit of 10 models or less (5 models or less if Cavalry, or 3 models or less if a Monstrous Beast, Monstrous Infantry or Monstrous Cavalry unit) can adopt a 'Loose Formation' as part of a reform (or during deployment). 

  In 'Loose Formation', models in a unit are not arrayed in lines and ranks, but rather as a loose group or rough line. All models in the unit must remain within 1/2" from at least one other model from the unit.
Models in the unit move individually (do not wheel the unit as a whole) and can pivot freely, but the whole unit must end all its move with its models all within 1/2" of each other, and facing the same direction. 

  Units in 'Loose Formation' are NOT treated as Skirmishers for purposes of movement through terrain.
  
When charging, the front arc of any model  in the unit can be used to determine the whole unit's front arc. On a successful charge, all models move towards their target up to their charge distance, until a maximum of such models has been brought into base contact, lined up into a rank. Any remaining models are lined up in ranks and files, behind the front rank. When charged, once the enemy unit is in base contact, models in the unit in 'Loose Formation' move into base contact, maximizing models in contact, as described above.
Attacking units never gain flank and rear bonuses in Close Combat against units in 'Loose Formation', but units in 'Loose Formation' also count as having zero ranks, for both the purposes of Rank Bonus or disrupting an enemy unit. 
Furthermore, units in 'Loose Formation' do NOT benefit from Combat Result bonuses from Standards.

A non-Skirmisher unit may return to a normal ranked formation with a reform.

Skirmishers: in addition to ALWAYS having to be in 'Loose Formation' (regardless of number of models in the unit), Skirmishers have a 360 degree front arc (thus able to charge in any direction). Skirmishers also can shoot even if they have marched (although they will still take a -1 penalty To Hit), unless the weapon has the Move or Fire rule. In addition, ranged attacks targeted at a Skirmisher unit take a -1 To Hit penalty.

EDIT#1(changed so that units in Loose Formation do not have a facing, and have 360 degree front arc)
EDIT#2(changed so that front arc of a unit in Loose Formation is drawn from any model that composes it; Skirmishers have an all-around front arc)
EDIT#3(Non-skirmisher units in Loose formation are NOT treated as skirmishers when moving through terrain; non-skirmisher units in Loose Formation do not benefit from Combat result bonuses from Standards).

PROBLEM: large units listed in a player's army list sometimes become a problem when a scenario requires a different unit size (possibly to maneuver through terrain).
SOLUTION: A non-Skirmishing unit may divide itself into two separate units as a reform

As  reform maneouver, a unit may split itself in two, along a dividing line between any two ranks or any two files. Separate the two units by shifting one of them slightly from the other by 1". Command group and character models may be distributed as desired between the two units, within the restrictions of a reform. Any effects (such as a spell) that the original units was currently suffering (or benefiting) from apply to both daughter units.
Note that each of the "daughter units" must consist of a number equal or higher than the minimum number of models required to field the unit.