plugins: possibility to define new data type/format

Have a good evening,

As an astronomer, I need to enter coordinates in the classical sexagesimal
format using degrees (0 to 360 with 1/60 and 1/3600 divisions) or angle
hours (0 to 24 with 1/60 and 1/3600 divisions, that's right ascension). 
Using "time" format with "[HH]:mm:ss" is OK, until one has to use
trigonometric functions to perform spherical trigonometry... then you have
to multiply by 180/pi() or 12/pi() in each call to a trigonometric function,
and not to get confused between declination (180/pi) and right ascension

Would it be possible to define a new data type via plugins (angles using
radians internally, but displaying something else via formats, like dates
that are represented internally like an offseted Julian Day) like one
defines functions? 


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