I noticed that there are some adjectives that have ~がる suffix to make them into verbs. Some examples from WWWJDIC:
ほしがる
こわがる
いたがる
くるしがる
さびしがる
うれしがる
Apparently ~たい form also can take the ~がる suffix to become ~たがる suffix:
いきたがる
Rikaichan popup explains the ~がる as:
to feel (on adj-stem to represent third party's apparent emotion); to behave as if one were
So I thought that I could append this suffix to any adjectives to add those connotations. However, it seems that not all adjectives and ~たい have the suffix. WWWJDIC does not return any exact matches for the following words:
やさしがる (to behave as if one were nice?)
きたがる (to feel that one wants to come? - Since いきたがる exists so logically きたがる should exist too?)
ねむがる (to behave as if one were sleepy?)
My question is, as in the title, is ~がる suffix limited to specific adjectives only? How do we know which adjectives can have the suffix and which adjectives can't?