Controllable Disadvantage

Controllable Disadvantage is listed in PU2 (July 2008) on pg 12 for mental (Will roll) and pg 13 for physical (HT roll).
==magic version==
feb 2009 GURPS Thaumatology: Magical Styles pg 25 also lists this as Controlled (Disadvantage) among Intuitive Cantrips.
That version has the drawback of presumably not being usable in No Mana zones (-10% limitation).
To offset that, it should probably enjoy Magery bonuses (so long as it pertains to Body Control or Mind Control) to the appropriate HT or Will rolls.
==using advantages==
If an advantage has Temporary Disadvantage then if it is switchable, the disadvantage can be switched on and off with the advantage.
==using enhancements==
If the Temporary Disadvantage limitation is designed using the Limited Enhancements rule, then without needing to switch off the ability, simply switching off the enhancement using Selectivity could accomplish the same outcome.
==for Limitations==
Limitations resemble Disadvantages in that they lower a point total. However these are modifiers which make Advantages worth fewer, rather than subtracting from advantages to calculate net.
As discussed previously, a limitation can be switched on and off if it's riding an enhancement.
If the actual enhancement doesn't matter, then it could simply be treated as a 1% placeholder so that "can apply a limitation if I want to" is worth a net 1%.
Elsewhere this might be described as a +5% enhancement.
Either way, it does create problems with certain limitations like Insubstantial Only if not requiring Affects Insubstantial as a prerequisite, or Substantial Only if not requiring Affects Substantial as a prereq.
==see also==
*Regulatable Limitation
Category:Perks