What options are available to use in the test command besides colorslider=?
There are some, we have not documented them in any way as those features are likely to be removed or changed. Here are some, use at your own risk (as you do anything with RD 
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[VKB=GAUGE_NAME,KEY_OR_TEXT]
VKB Keys: DEL,BACKSPACE,CLEAR,ENTER
[VALUESOURCE=GAUGE_NAME]
[RANGEMAX=IDXXX]
XXX is id number of the input, see list on manual
[PREFIX=TEXT]
[POSTFIX=TEXT]
[NODOT]
[ABS]
[UTC=HRS:MIN]
Works if input is Device->Time (ISO), Date, or Weekday
Examples:
[UTC=5:30] show UTC +5hrs 30min
[UTC=-7:30] show UTC -7hrs 30min
[SUBFRAME=SPEEDUNITS]
Set 4 subframes to atlas image. Image subframe is selected per speed setting:
0=Kilometers per hour
1=Meters per second
2=Miles per hour
3=Knots
[SUBFRAME=DISTANCEUNITS]
Set 3 subframes to atlas image. Image subframe is selected per distance setting:
0=Kilometers
1=Miles
2=Nautical Miles
[SUBFRAME=FUELCONSUNITS]
Set 5 subframes to atlas image. Image subframe is selected per fuel consumption setting:
0=Liters per 100 km
1=MPG US
2=MPG UK
3=Km per liter
4=Liters per hour
[SUBFRAME=TEMPUNITS]
Set 2 subframes to atlas image. Image subframe is selected per temperature setting:
0=Celsius
1=Fahrenheit
[SUBFRAME=LANGUAGE]
Set subframes to image based on currently selected language:
0=en
1=fi
2=hu
3=tr
4=fr
5=cs
6=pl
7=nl
8=it
9=pt
10=es
11=de
12=ru
13=sv
14=ar
15=uk
16=zh
[COLORSLIDER=GAUGE_NAME]
When set on gauge, its blend color is fetched from that slider.
Some of them I hope they don’t change. Lol
Can you list what the others do that didn’t have a description on them above?
That is a complete list.