Some minor suggestions
 

Instead of having separate point buy totals of 15 20 and 25, combined all three and have user input max point buy. Sometimes non standard point buy are used and we have to use website to do the calculation.

have option of HP be inputted like Pathfinder Society or have average rolls (such as 5.5 for d10, 4.5 for d8 etc. Just to save on a bunch of clicking especially when you're designing specific encounters.

Have another option for character advancement that doesn't use XP. Some games don't keep track XP and level up when story mark occurs.

On the "Adjust" tab, under "Other Adjustments", or on the "Personal" tab, under "Permanent Adjustments", you can add an adjustment for "Attribute point buy", and add more points.

Hey noob

For non standard systems like that, there is the option to pick ability scores. I think that adding in an option to pick number of points in point buy might be more complicated than you think, and could throw errors when the character is changed to a different set of parameters

There is an option under configuration that allows either average HP or Max HP per level

Also the option to change advancement from None/Slow/Medium/Fast/PFS is already inherant to the program, press Ctrl+K and scroll to the near bottom until you get to the advancement speed

If you want a 23 point buy, which is non-standard, you could always go with 25 and then stop spending the points when two were left unspent.

If you wanted a 31 point buy, go with the 25, and continue until your overspend warning lets you know you've spent 6 too many.

In the latter case, you could then Control - K and set attributes to choose a total rather than a point buy, which would remove the red warning that you've spent more than your point buy.

The No XP required option only exists if you have the Community Pack installed. Its not a CORE LW feature.

I wasn't aware of that, cool