How to configure pause/resume over pin 10 of parallel port?

It all should be possible to configure using the included wizards, did you try them?
Use StepConf for parallel port or PncConf for Mesa boards.
Also, pin 17 is output, so what input are you reffering to?

Spindle.n.on
That should be the hal pin controlling the spindle (on phone can not check).
If using later versikn of LinuxCNC, the spindle on gcode is
M3 S24000 $0
S24000 is the RPM
$0 is spindle 0 of the first installed spindle as there can be several spindles.
One thing to keep in mind, if you set just the spindle on pin, it should just turn the spindle on, but if you do have a spindle pwm pin, then the spindle will not trun on from gcode without the speed value included.
! Means active low in 3d printers
Active low is whatever signal sign or name with the dash above.
What GUI are you using?

Leave them in breaks cleaning fluid for a night, should unclog... hopefully
Use an LED and a resistor on a parallel port pin and gnd, look at them turning on and off while joging in LinuxCNC.