Neospector

All special nodes expire (this is why they cannot be upgraded), but can be disassembled for 50 shards. Their expiration date can be found by hovering over the nodes in the enhancement window or V-matrix. If you plan on using a special node, the efficient method people use is to wait until the last minute and then disassemble the shard for future crafting.

Overall it's better to not rely on special nodes. Work on perfecting your job skills or generic skills instead; it will give you a more solid damage boost and leaves slots open for future 5th job skills.

Since the skill animations are stored inside the game files, I wouldn't risk it.

That being said, there has been at least three separate games that I know of using Maple sprites with custom animations (FinalStory, the Learn Japanese game, and that one guy who made a game to propose to his girlfriend) and numerous animations, so you're not the only one who's been inspired to create their own stuff. If you want to show off any work you've done, you can do so in the fan creations forum and on the subreddit. But I wouldn't suggest modifying the game files themselves.

The problem is that this skill is pathetically weak. The skill description says that at level 1 it periodically deals 500% damage. Seems kinda weak for a 5th job skill, but perhaps the number of hits per second can make up... Nope! When I checked through the battle statistics analysis, it (not counting the explosion) landed total of 8 hits. 8 hits * 500% damage over the course of 10 seconds. 3rd jobs skills can deal more damage than that.

The explosion's damage is rather decent, but I can assure you that it's not worth 2-min cooldown.

Level 1 skills are all weak. You're supposed to level them up to deal their true damage.

For example, F/P DoT Punisher: 415% damage 5 times at level 1. At level 20, 700% damage.

You're also supposed to detonate the skill before it expires to deal more damage, you're forgetting to factor that in.

You can only kill the head once per day, regardless of how many keys you have.

As such, most people use their first two runs to grind coins at the shoulders and abdomen, and then leave, killing the head on the third run.

Not Exactly what I was refering to, But It doesnt matter if they are interested or not, Currently they can record whatever they would like and everyone playing Maplestory is in agreement (Even if thats not what they do)

They cannot. Many people have speculated about what the security programs record and claim that they record as much as malware, citing vague references to people "pulling apart" the programs or monitoring their usage, all without any sort of actual evidence.

The security programs record mostly active programs running alongside the game, nothing more than any other security program or antivirus. This has been actually documented by monitoring usage of the program.
Scanning Random Access Memory (RAM), video card, CPU, etc is all basic diagnostic data. There isn't a game in the world that doesn't access these.