notboring

Short answer:
No, it’s can’t

Long Answer:
If a browser script could disable keys like print screen on your computer globally this would be a major security problem. Imagine a script delivered by an ad provider blocking all keys on your keyboard until you pay bitcoins. So clearly the answer is no.

After some small optimisations (disabling Woocomerce, enabling page caching in Wordfence solving the wpml resource usage) the site loads faster but now Nextgen Gallery Pro uses more then 50% of all resources:

P3 (Plugin Performance Profiler) – 0.0087 sec – 0.24%
Contact Form 7 – 0.0701 sec – 1.95%
DesignThemes Core Features Plugin – 0.0565 sec – 1.57%
Duplicator – 0.0164 sec – 0.46%
Google Analytics Dashboard For Wp – 0.0212 sec – 0.59%
Maintenance – 0.0066 sec – 0.18%
Nextgen Gallery Pro – 1.4293 sec – 39.72%
Nextgen Gallery – 0.6585 sec – 18.30%
Responsive Maps Plugin – 0.0030 sec – 0.08%
Revolution Slider – 0.0796 sec – 2.21%
Roses Like This – 0.0053 sec – 0.15%
Sitepress Multilingual Cms – 0.5701 sec – 15.84%
Social Media Feather – 0.1808 sec – 5.02%
TablePress – 0.0666 sec – 1.85%
The Events Calendar – 0.1452 sec – 4.04%
Wordfence Security – 0.0716 sec – 1.99%
Wordpress Seo – 0.1129 sec – 3.14%
WP-CopyProtect [Protect your blog posts] – 0.0020 sec – 0.05%
WP Site Protector – 0.0019 sec – 0.05%
Wpml Cms Nav – 0.0146 sec – 0.41%
Wpml Sticky Links – 0.0121 sec – 0.34%
Wpml String Translation – 0.0566 sec – 1.57%
Wpml Translation Management – 0.0089 sec – 0.25%