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I'm trying to figure out a way to set up my tokens so that if a token gets added to the screen, I can roll the hit points automatically, provided that I've set up the HD beforehand.

Is there an event for the token being added to the map? Essentially, if the token's HP are blank then roll, otherwise keep the current value.

There is no real event for newTokenDropped.

You can do a trick. The default property values can include macro code. You can place a roll-and-overwrite macro there. It happens not on drop - but when statsheet is shown.

So, if your token has a set value the property (lets call it HP) contains that value. The default is a macro like [r: HP = 1d10]

If it is shown it rolls hitpoints and overwrites the default value, so next time the stat sheet is shown nothing happens.

Whew ... is that understandable?
Search the forum for "stat sheet trick" or something like that .. there are several postings about that. I dont know the exact format how to include macro in the property set out of my head, but try-and-error or forum search should bring it.

This is why I love browsing the macros section: people asking questions I thought I already knew the answer to and finding out I'm wrong. Swapping all my tokens to this!

Neat trick

So is there a way to get this to run more complex code? At the moment I can figure out how to assign properties values, but not much else.

Ultimately I'm thinking of having the code set properties based on user input. Can this be done?

You can only include one line of code. But since you can call other macros - at least as user defined function (see Wiki: defineFunction()), but IIRC with [macro:] as well - you can call as complex code as you want. Be sure to test it well, you dont want the statsheet to call a buggy macro!

I initially came up with this trick, its actually one of the first code tricks I introduced into the community a loooong time ago.... and I also abandoned it again for another trick, with the same results, but 'safer'
Fitst of I created a small drop in which can help you use this onMouseOver event, you can find the link on how to use it in my signature and a small wiki article I wrote: onMouseOverEvent

Second: the trick for which I swapped this one is the (actually existing) onChangeSelection. To use this you will need a form active, this can be an info box, a character sheet, or in my case: token related macros. The trick then is simple:
1. first you need a token property (preset in the settings) e.g. 'initialize:1'
2. in the form you need one line where 'macroLink' is an actual macro link to a macro.
3. the macro is run EVERY time you select on a token (thus also when you just click on it). In my case I check the token property set of the token e.g. 'vehicle' and then redirect the macro to another macro that builds the form with macro buttons specifically for vehicles. To start the 'token initializer' you simply need a couple of lines of code:

In the 'initializeToken' you obviously need to set 'initialize = 0' or the macro will be invoked every time you select the token.

This boils roughly down to the method using the onMouseOverEvent, but this is more stable.